Refresh An SQLDataSource Object Programmatically
Oct 27, 2006
Background - I have a page that uses a numeric value stored in a Session object variable as the parameter for three different SQLDataSource objects, which provide data to two asp:Repeaters and an asp:DataList. Also, in the Page_Load, I use this value to to seed a stored procedure and an SQLDataReader to populate several unbound Labels. This works fine. In addition, I have a collection of 6 TextBoxes, an unbound Listbox, and two Buttons to allow the user to do searching and selection of potential matches. This basically identifies a new numeric value that I store in the Session variable and PostBack the page (via one of the buttons). This also works fine.
Problem - I have been tasked with taking a different page and adding six textboxes to collect the search values, but to post over to this page, populate the existing search-oriented TextBoxes, adn programmatically triggering the search. Furthermore, I have to detect the number of matching records and, if only 1, have the Repeaters and DataList display the results based on the newly selected record's key numeric value, as well as populating the unbound Labels. I have managed to get all of this accomplished except for programmatically triggering the Repeaters and DataList "refresh". These controls only populate as expected if a button is clicked a subsequent time, which makes sense, since that would trigger a PostBack and the Page_Load uses the new saved numeric key value from the Session.
My history in app development is largely from Windows Forms development (VB6), this is my second foray into Web Form dev with ASP.NET 2.0. I am willing to acceptthat what I am trying to do does not fit into the ASP environment, but I have to think that this is something that has been done before, and (hopefully) there is a way to do what I need.
Any ideas, oh great and wise Forum readers? *smile*
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Nov 27, 2007
I am sending a GUID to a form via the query string. If it exists I use helper functions to load most of the form text boxes. However, if it does not then a blank form is presented and the GUID is stored in a hidden field.
Regardless, I use this hidden field to populate a grid that is attached to a sqldatasource.
If I then add new datarows to the backend database programmatically, I cannot 'requery' the datasource to include those row upon a postback. I cannot seem to find a simple way to force the sqldatasource to rerun the query.
Can anyone help.
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Jul 16, 2007
Dear sirs:I have a Web Form with an SqlDataSource with a simple select statement, and a GridView control that is tied to it. There is a ComboBox (which provides the filter-command parameter) and a Submit button as well. When a selection is made (the first time) in the combo box and then the submit button is clicked, the Selecting Event for the SqlDataSource fires and the code works perfect.However, on subsequent "submits" with the button and selecting a different month from the combo box, I cannot get that event to fire again. What do I need to do to get this event to fire everytime the submit button is clicked and a new selection made from the drop down combo box; thus letting me know that new data is being fetched from the database?Here is the code for the SqlDataSource:<<asp:SqlDataSourceID = "sqlDataSourceG5WingRailCar" runat = "server" ConnectionString = "<%$ ConnectionStrings:oracleConnectionString %>"ProviderName = "<%$ ConnectionStrings:oracleConnectionString.ProviderName %>" SelectCommand = "select distinct to_date( mh.historydatetime , 'DD-MM-YYYY' ) , rh.movedescription , ( mds.pct_util * count( rh.movedescription ) ) from requesthistory rh inner join movehistory mh on rh.itd_number = mh.itd_number inner join movedescription mds on rh.movedescr_id = mds.movedescr_id where rh.movedescr_id = 1 AND mh.discrepancy_id = 25 AND EXTRACT(MONTH FROM mh.historydatetime) = :MONTH_ID group by to_date( mh.historydatetime , 'DD-MM-YYYY' ) , rh.movedescription , mds.pct_util order by to_date( mh.historydatetime , 'DD-MM-YYYY' )" önSelecting="sqlDataSourceG5WingRailCar_Selecting" ><<SelectParameters>><<asp:ControlParameter ControlID = "dropDownListMonth" Name = "MONTH_ID" PropertyName = "SelectedValue" >><</asp:ControlParameter>><</SelectParameters>> <</asp:SqlDataSource>>There really is no code for the Selecting Event, other than just capturing some text into a label when the event occurs (for testing purposes).Thanks
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Apr 17, 2007
Hello. Im trying to create an SQLDataSource control programmatically. I need to do this because I want to do some stuff on my MasterPage's 'Page_Init' event.
heres my code (Master.master.vb): Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
lblUser.Text = Page.User.Identity.Name
Dim PUser As New ControlParameter
PUser.ControlID = "lblUser"
PUser.Name = "LoginName"
PUser.PropertyName = "Text"
PUser.Type = TypeCode.String
PUser.DefaultValue = Page.User.Identity.Name
Dim SQLDS_Login As New SqlDataSource
SQLDS_Login.ID = "SQLDS_Login"
SQLDS_Login.ConnectionString = "I put conection string here. How do I use the one on my web.config?"
SQLDS_Login.SelectCommand = "SELECT [LoginID], [LoginName], [Role], [Status] FROM [myLogin] WHERE ([LoginName] = @LoginName)"
SQLDS_Login.SelectParameters.Add(PUser)
SQLDS_Login.SelectCommandType = SqlDataSourceCommandType.Text
GridView1.DataSource = SQLDS_Login
GridView1.DataBind()
End Sub
When i run, i get this error message:
The SqlDataSource control 'SQLDS_Login' does not have a naming container. Ensure that the control is added to the page before calling DataBind.
I never had any problem with Inserts, Updates and Deleting, but I have never made it work for Select when doing it programmatically.
Can you help me with this?
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Jul 15, 2007
I am trying to add a number of dates into a Sql database. Basically I want the user to add the start and end date and then all the dates in between are are added to a database in unique records. I can create an ArrayList but I don't know how to bind it to an SqlDataSource Dim startdate As DateTime = tbstartdate.Text Dim enddate As DateTime = tbenddate.Text Dim datediff As TimeSpan = enddate.Subtract(startdate) Dim noofdays As Integer = datediff.Days Dim ar As New ArrayList Dim i For i = 0 To noofdays ar.Add(startdate.AddDays(i)) Next Sorry if this is a total noob question....
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Apr 27, 2006
I have a GridView bound to a SqlDataSource. On page load I would like to programmatically specify a SelectParameter value based on the role of the user. This SelectParameter will be used in my WHERE clause. The closest post I can find is http://forums.asp.net/thread/1233258.aspx but no answer was posted.
What code would I use to modify a SelectParameters value? Is it possible to reference a parameter by name (SqlDataSource1.SelectParameters["usertype"]) or does it have to be by index? (SqlDataSource1.SelectParameters[0])
Alternatively, perhaps I'm going about this in the wrong way, is there a better way to have dynamic GridView content based on the role of the user?
Thank you very much for your help.
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Jul 3, 2007
ello all
Would someone be so kind as to save me from getting balder through pulling my hair out.
My aim is to extract data from a database using SQLDataSource, then edit the data and update the database using the SQLDataSource.
I have achieve the problem of retrieving the data from the sqlDataSource:DataView openRemindingSeats = (DataView)SqlDataSource2.Select(DataSourceSelectArguments.Empty); //Int32 openRemindingSeats = SqlDataSource2.Select(DataSourceSelectArguments.Empty), DataView;
foreach (DataRowView rowProduct in openReminding) { //Output the name and price lbl_NumOfSeatsLeft.Text = rowProduct["Remaining"].ToString();
}
Within the sqlDataSource the sql code is as follows:SELECT [refNumber], [refRemaining] FROM [refFlights] WHERE ([refNumber] = @Number)
So at the moment my problems is being able to edit and update data to the same SELECTed data.Thank you for any help that you might have...
SynDrome
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Aug 1, 2007
Hi, All
I'm using Gridview and SqlDataSource to dynamically display the contents in different tables, as followed:
<% dataSource.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["connectionString"]; dataSource.SelectCommand = "SELECT * FROM " + tableName; gridView.DataBind();
dataSource.UpdateCommand = "";%>
<asp:SqlDataSource ID="dataSource" runat="server"></asp:SqlDataSource><asp:GridView ID="gridView" runat="server" DataSourceID="dataSource" AllowPaging="True" AllowSorting="True" AutoGenerateEditButton="True" BorderColor="Silver" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" PageSize="20" DataKeyNames="ID" OnRowDataBound="tableGridView_RowDataBound"> <HeaderStyle BackColor="#C0C0FF" /> <AlternatingRowStyle BackColor="#C0FFC0" /></asp:GridView>
The datasource take the "tableName" as argument to determine which table to display. My problem is I can't figure out a way to programmatically construct the UpdataCommand for the SqlDataSource. I try to get the field names from the HeaderRow, but all the cells are empty in this row.
Does anyone know what causes the problem or how to construct the UpdateCommand properly. Thanks!
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May 13, 2006
I am using SqlDataSource programmatically in my data access layer - mainly for convenience but it does generally work fine with no obvious performance issues.
The problem I have is with getting back an output parameter. I have an insert-type stored procedure (in Sql Server 2005) operating on a table with an identity column as the primary key:
ALTER PROCEDURE [dbo].[InsertAlbum](@ArtistID int, @Title nvarchar(70), @NewID int OUTPUT)ASDECLARE @err intINSERT INTO dbo.ALBUMS (ARTISTID, TITLE)VALUES (@ArtistID, @Title)SELECT @err = @@error IF @err <> 0 RETURN @errSET @NewID = SCOPE_IDENTITY()
This works fine when run from Sql Server Management Studio and @NewID has the correct value.
My data access code is roughly as follows:
dsrc = New SqlDataSource()dsrc.ConnectionString = ConnectionStringdsrc.InsertCommand = "InsertAlbum"dsrc.InsertCommandType = SqlDataSourceCommandType.StoredProcedureDim parms As ParameterCollection = dsrc.InsertParametersDim newid As IntegerAddParameter(parms, "ArtistID", TypeCode.Int32, ParameterDirection.Input, 0, album.ArtistID)AddParameter(parms, "Title", TypeCode.String, ParameterDirection.Input, 0, album.Title)Dim p As New Parameter("NewID", TypeCode.Int32)p.Direction = ParameterDirection.Outputparms.Add(p)Try Dim rv As Integer = dsrc.Insert() newid = parms("NewID") Return newidCatch ex As Exception Return -1End Try
The row is inserted into the database, but however I try to define and add the NewID parameter it never has a value.
Has anyone tried to do this and can tell me what I am doing wrong?
Jon
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Sep 8, 2006
I need to provide defaults and sometimes overrides for items in SQLDataSource's UpdateParameters. I am attempting to do this in a FormView's ItemUpdating and ItemInserting events as follows: //========================================================================
// FormView1_ItemUpdating:
//========================================================================
protected void FormView1_ItemUpdating(object sender, FormViewUpdateEventArgs e) {
// not sure if this is the bets place to put this or not?
dsDataSource.UpdateParameters["UpdatedTS"].DefaultValue = DateTime.Now.ToString();
dsDataSource.UpdateParameters["UpdatedUserID"].DefaultValue = ((csi.UserInfo)Session["UserInfo"]).QuotaUserID;
}
In the example above I am attempting to set new values for the parameters which will replace the existing values. I have found that using the DefaultValue property works ONLY if there is no current value for the parameter. Otherwise the values I specify are ingnored.The parameters of an ObjectDataSource provide a Value property but SQLDataSource parameters do not.How can I provide an override value without needing to place the value in the visible bound form element???If you can answer this you will be the FIRST person ever to answer one of my questions here!!!Thanks,Tony
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May 19, 2007
I just want to insert a record into a table using a SqlDataSource control. But I'm having a hard time finding examples that don't use data bound controlsI have this so far (I deleted the parts not related to the insert):<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:UserPolls %>" InsertCommand="INSERT INTO [PollAnswers] ([PollId], [AnswerText], [AnswerCount]) VALUES (@PollId, @AnswerText, @AnswerCount)" <InsertParameters> <asp:Parameter Name="PollId" Type="Int32" /> <asp:Parameter Name="AnswerText" Type="String" /> <asp:Parameter Name="AnswerCount" Type="Int32" /> </InsertParameters> </asp:SqlDataSource> This is the data source for a gridview control I have on the page. I could set up an SqlDataSource for this alone if I need to, but i don't know if it would help. From what I could find, in the code behind I should haveSqlDataSource2.Insert()and SqlDataSource2 will grab the parameters and insert the record. The problem is I need to set the Pollid (from a session variable) and AnswerText (from a text box) at run time. Can I do this?Diane
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Sep 9, 2007
Hey All for some reason I can not get this right and/or find what I am looking for.
I have an SQLDataSource with a PartID set as the filtered value in the Datasource Query.
I am trying to use code beside to set the value and I am failing...lol...
Here is my attempt at it,
SqlDataSource1.SelectParameters("PartID") = txtPartID.Text
Any help would be great!
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Nov 3, 2007
Hi
I think I've programmatically created a SqlDataSource - which is what I want to do; but I can't seem to access details from the source - row 1, column 1, for example????
If Not Page.IsPostBack Then
'Start by determining the connection string valueDim connString As New Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)
'Create a SqlConnection instanceUsing connString
'Specify the SQL query
Const sql As String = "SELECT eventID FROM viewEvents WHERE eventID=17"
'Create a SqlCommand instanceDim myCommand As New Data.SqlClient.SqlCommand(sql, connString)
'Get back a DataSetDim myDataSet As New Data.DataSet
'Create a SqlDataAdapter instanceDim myAdapter As New Data.SqlClient.SqlDataAdapter(myCommand)
myAdapter.Fill(myDataSet)Label1.Text = myAdapter.Tables.Rows(0).Item("eventID").ToString() -??????????????
'Close the connection
connString.Close()
End Using
End IfThanks for any helpRichard
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Oct 10, 2006
Im ripping my hair out here.I need to access the field in a datasource control of use in non presentation layer code based actions.I know the I can use a code base connection and query but I dont see why i need to make two trips the the DB when the info is already available.The datasource is attached to a details view control and the details view control is nested in a loginview controlI've tried defining but all I can get in the header name of the field but not the dataitem, the dataitem causes an error help please jim
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Jun 20, 2007
I've found example code of accessing an SQLDataSource and even have it working in my own code - an example would be Dim datastuff As DataView = CType(srcSoftwareSelected.Select(DataSourceSelectArguments.Empty), DataView) Dim row As DataRow = datastuff.Table.Rows(0) Dim installtype As Integer = row("InstallMethod") Dim install As String = row("Install").ToString Dim notes As String = row("Notes").ToString The above only works on a single row, of course. If I needed more, I know I can loop it.The query in srcSoftwareSelected is something like "SELECT InstallMethod, Install, Notes FROM Software"My problem lies in trying to access the data in a simliar way when I'm using a SELECT COUNT query. Dim datastuff As DataView = CType(srcSoftwareUsage.Select(DataSourceSelectArguments.Empty), DataView) Dim row As DataRow = datastuff.Table.Rows(0) Dim count As Integer = row("rowcnt") The query here is "SELECT COUNT(*) as rowcnt FROM Software"The variable count is 1 every time I query this, no matter what the actual count is. I know I've got to be accessing the incorrect data member in the 2nd query because a gridview tied to srcSoftwareUsage (the SQLDataSource) always displays the correct value. Where am I going wrong here?
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Mar 7, 2008
Hello, I want to loop through the first 10 records that are showing in a gridview with several pages that is populated by a sqldatasource. I can loop through the sqldatasource and get the list of values, but I'm doing something wrong because the 10 records it prints out are not the same 10 records the user sees in the gridview...They can click a search button which changes the sort, and they can click on the column headings to change the sort order.
Where's the best place to put the looping code? I need the result to be the same as what the users sees.
1 Protected Sub GridView1_Sorted(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.Sorted2 Dim i As Integer = -13 Dim sTest As String = ""4 Dim vwExpensiveItems As Data.DataView = CType(SqlDataSource1.Select(DataSourceSelectArguments.Empty), Data.DataView)5 6 'Loop through each record7 i = -18 For Each rowProduct As Data.DataRowView In vwExpensiveItems9 i = i + 110 'Output the name and price11 If i > 9 Then12 Exit For13 End If14 sTest = rowProduct("employeeid")15 Response.Write("RowSorting " & i.ToString & " [" & sTest & "]<br>")16 Next17 End Sub18
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May 29, 2008
If a page contains a SQLDataSource object with a connection string that works on other pages, can that datasource be used in the codebehind to create a DataReader thereby avoiding the need to DIM and create a new connection string? My code fails but I can't figure out what to try next. Thanks.
Dim queryString As String = "SELECT * FROM users "
Using SqlDataSource1
Dim command As New Data.SqlClient.SqlCommand(queryString)
Dim oReader As Data.SqlClient.SqlDataReader = command.ExecuteReader()
' Call Read before accessing data.
While oReader.Read()
Console.WriteLine(String.Format("{0}, {1}", oReader(0), oReader(1)))
End While
' Call Close when done reading.
oReader.Close()
End Using
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Apr 7, 2007
Hello, thanks for reading my post!
Ok, so I connected to my database. I can insert data and all that good stuff, but when it comes time to make the login page for a project I am working on, sadly I cant figure out how to read data from my datasource object O_O.
So I have an SqlDataSource object, its bound to my sql database ( successfully ), I can even set it to return the results I want, my question though is how do I access the results it returns so I can compair it with code?
Hope I'm making sense! Any help is *greatly* appreciated!
Thanks!,
-Bob
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Nov 8, 2007
.. the Membership ProviderUserKey value as the parameter of a stored procedure ?It seems obvious to me that you would want to do this, but I can only see that it allows you to pass Profile parameters.
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Sep 13, 2006
I am trying to set the value of a SqlDataSource parameter named "InvestmentGroup" with the following code:ProjectData.SelectParameters["InvestmentGroup"] = Request.QueryString[0];ProjectData.DataBind();When I try this, I get an error saying that the right side is a string and the left side is not....but I cannot find a property of the SelectParameters["InvestmentGroup"] object like Value or something that would allow me to set the value of the parameter with a string. Please help!
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Mar 6, 2007
I am updating data with sqlDatasource but it is inserting NULL, tell what I am missing <asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource1"
DefaultMode="Insert" Width="100%">
<InsertItemTemplate>
<table width="100%">
<tr>
<td style="width: 100px">
Name</td>
<td style="width: 100px">
<asp:TextBox ID="txtCategory" runat="server" Text='<%# Eval("CategoryName") %>'></asp:TextBox></td>
</tr>
<tr>
<td style="width: 100px">
Parent</td>
<td style="width: 100px">
<asp:DropDownList ID="ddlParent" runat="server" DataSourceID="SqlDataSource1" DataTextField="CategoryName" DataValueField="CategoryID" Width="100%">
</asp:DropDownList></td>
</tr>
<tr>
<td style="width: 100px">
</td>
<td style="width: 100px">
<asp:Button ID="btnAdd" runat="server" Text="Add" CommandName="Insert"/></td>
</tr>
</table>
</InsertItemTemplate>
</asp:FormView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:CommerceTemplate %>"
SelectCommand="SELECT [CategoryID], [CategoryName], [CategoryMID] FROM [CMRC_Categories]"
DeleteCommand="DELETE FROM [CMRC_Categories] WHERE [CategoryID] = @CategoryID"
InsertCommand="INSERT INTO [CMRC_Categories] ([CategoryName], [CategoryMID]) VALUES (@CategoryName, @CategoryMID)"
UpdateCommand="UPDATE [CMRC_Categories] SET [CategoryName] = @CategoryName, [CategoryMID] = @CategoryMID WHERE [CategoryID] = @CategoryID">
<DeleteParameters>
<asp:Parameter Name="CategoryID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="CategoryName" Type="String" />
<asp:Parameter Name="CategoryID" Type="Int32" />
<asp:Parameter Name="CategoryMID" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:FormParameter Name="CategoryName" Type="String" FormField="txtCategory" />
<asp:FormParameter Name="CategoryMID" Type="Int32" />
</InsertParameters>
</asp:SqlDataSource> Please suggest cheers
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May 21, 2007
I'm an "old" programmer but new to ASP.NET.
I want to get a value from the SQL Dataset.
What I would normally do in other environments is iterate through the dataset to get the value I would be intrested in, but I can't figure out how to do this without using a visual data display object like a Grid view.
Typically I want to get a value from the database that I then after manipulating it, like multply by 5, use to format something on the page.
thanks in advance,
Thommie
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Dec 29, 2007
hi i want to select data based on a user id, which is stored in a custom object-> sessionhandler.user.id
how can i put that in the select parameter?
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:RentTodaySQL %>" DeleteCommand="DELETE FROM [Rentals] WHERE [RentalID] = @original_RentalID"
InsertCommand="INSERT INTO [Rentals] ([Headline], [Description], [MoveInSpecial], [MonthlyCost], [Deposit], [AvailableDate], [FeaturedListing], [UserID], [Address], [Address2], [City], [State], [Zip], [LeaseTermID], [LeaseDetails], [Section8], [Section8Details], [PetsAllowed], [PetsDetails], [PetDeposit], [ApplicationFee], [ApplicationDetails], [SmokingAllowed], [RentalCategoryID], [Bedrooms], [Bathrooms], [SqFootage], [LotSize], [YearBuilt], [DefaultImageID]) VALUES (@Headline, @Description, @MoveInSpecial, @MonthlyCost, @Deposit, @AvailableDate, @FeaturedListing, @UserID, @Address, @Address2, @City, @State, @Zip, @LeaseTermID, @LeaseDetails, @Section8, @Section8Details, @PetsAllowed, @PetsDetails, @PetDeposit, @ApplicationFee, @ApplicationDetails, @SmokingAllowed, @RentalCategoryID, @Bedrooms, @Bathrooms, @SqFootage, @LotSize, @YearBuilt, @DefaultImageID)"
OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT * FROM [Rentals] WHERE ([UserID] = @UserID)"
UpdateCommand="UPDATE [Rentals] SET [Headline] = @Headline, [Description] = @Description, [MoveInSpecial] = @MoveInSpecial, [MonthlyCost] = @MonthlyCost, [Deposit] = @Deposit, [AvailableDate] = @AvailableDate, [FeaturedListing] = @FeaturedListing, [UserID] = @UserID, [Address] = @Address, [Address2] = @Address2, [City] = @City, [State] = @State, [Zip] = @Zip, [LeaseTermID] = @LeaseTermID, [LeaseDetails] = @LeaseDetails, [Section8] = @Section8, [Section8Details] = @Section8Details, [PetsAllowed] = @PetsAllowed, [PetsDetails] = @PetsDetails, [PetDeposit] = @PetDeposit, [ApplicationFee] = @ApplicationFee, [ApplicationDetails] = @ApplicationDetails, [SmokingAllowed] = @SmokingAllowed, [RentalCategoryID] = @RentalCategoryID, [Bedrooms] = @Bedrooms, [Bathrooms] = @Bathrooms, [SqFootage] = @SqFootage, [LotSize] = @LotSize, [YearBuilt] = @YearBuilt, [DefaultImageID] = @DefaultImageID WHERE [RentalID] = @original_RentalID">
<SelectParameters>
<asp:Parameter DefaultValue="<%= SessionHandler.User.ID %>" Name="UserID" Type="Int32" />
</SelectParameters>
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Feb 22, 2007
Hi,
I am trying to get the selected options from a listbox and either pass a SqlDataSource object the array or loop through it and pass each element of the array. I then need to modify the returned databtable to graphing function, but first drop the last column. I was wondering if anyone can help me with the following:
1. Pass an array into SqlDataSource Select OR 2. Pass a single argument into the Select statement and populate a datatable without it writing over the current row each time it iterates through the foreach statement. I am looking for the dataview to append to dt each time it loops. Is there a property for dataview that behaves like the "ClearBeforeFill" for table adapters?3. Update a parameter programmatically
Below code works, but I think it can be more efficient. Any suggestions would be greatly appreciated.
Thanks in advance!!
DataTable dt = new DataTable(); DataTable dt2 = new DataTable(); DataView dv = new DataView();
foreach(ListItem liOptions in ListBox1.Items) { if(liOptions.Selected) { SqlDataSource1.SelectParameters.Add("Parameter1", liOptions); dv = (DataView)SqlDataSource1.Select(DataSourceSelectArguments.Empty); dt2 = dv.Table; dt.Merge(dt2); dt2.Dispose(); SqlDataSource1.SelectParameters.Clear(); } }
if (dt.Rows.Count > 0) { Graph(dt); //Pass original datatable (dt) to Graph(); dt.Columns.RemoveAt(2); //Reformat datatable (dt) and remove last column before binding to Gridview1
GridView1.DataSource = dt; GridView1.DataBind(); } else {
errorMessage.Text = "No data was returned!"; }
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Oct 19, 2006
I am trying to put the data from a field in my database into a row in a table using the SQLDataSource.Select statement. I am using the following code: FileBase.SelectCommand = "SELECT Username FROM Files WHERE Filename = '" & myFileInfo.FullName & "'" myDataRow("Username") = CType(FileBase.Select(New DataSourceSelectArguments()), String)But when I run the code, I get the following error:Server Error in '/YorZap' Application. Unable to cast object of type 'System.Data.DataView' to type 'System.String'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Data.DataView' to type 'System.String'.Source Error: Line 54: FileBase.SelectCommand = "SELECT Username FROM Files WHERE Filename = '" & myFileInfo.FullName & "'"
Line 55: 'myDataRow("Username") = CType(FileBase.Select(New DataSourceSelectArguments).GetEnumerator.Current, String)
Line 56: myDataRow("Username") = CType(FileBase.Select(New DataSourceSelectArguments()), String)
Line 57:
Line 58: filesTable.Rows.Add(myDataRow)Source File: D:YorZapdir_list_sort.aspx Line: 56 Stack Trace: [InvalidCastException: Unable to cast object of type 'System.Data.DataView' to type 'System.String'.]
ASP.dir_list_sort_aspx.BindFileDataToGrid(String strSortField) in D:YorZapdir_list_sort.aspx:56
ASP.dir_list_sort_aspx.Page_Load(Object sender, EventArgs e) in D:YorZapdir_list_sort.aspx:7
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +13
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +45
System.Web.UI.Control.OnLoad(EventArgs e) +80
System.Web.UI.Control.LoadRecursive() +49
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3743
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210 Please help me!
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Oct 11, 2006
Hi There,This is related to a ms access database but since I use the SqlDataSource control I thought I should post here.I have a project that I was working on with this ms access db and using sql controls, everything was working just finesince one day I started getting "Object reference not set to an instance of an object" messages when I try to designa query or retrieve a schema, nothing works at design time anymore but at runtime everything is perfect, its a lotof work for me now to create columns,schemas and everything manually, I've tried reinstalling visualstudio, ado componentsbut nothing seems to fix it, did this ever happen to any of you guys?any tip is really appreciated thanks a lot
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Dec 17, 2007
Does any one has any clue for this error ? I did went through a lot of articles on this error but none helped . I am working in Visual studie 2005 and trying to upload image in sql database through a simple form. Here is the code
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.IO;
public partial class Binary_frmUpload : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{
}protected void btnUpload_Click(object sender, EventArgs e)
{if (FileUpload.HasFile == false)
{
// No file uploaded!lblUploadDetails.Text = "Please first select a file to upload...";
}
else
{string str1 = FileUpload.PostedFile.FileName;
string str2 = FileUpload.PostedFile.ContentType; string connectionString = WebConfigurationManager.ConnectionStrings["GSGA"].ConnectionString;
//Initialize SQL Server Connection SqlConnection con = new SqlConnection(connectionString);
//Set insert query string qry = "insert into Officers (Picture,PictureType ,PicttureTitle) values(@ImageData, @PictureType, @PictureTitle)";
//Initialize SqlCommand object for insert. SqlCommand cmd = new SqlCommand(qry, con);
//We are passing Original Image Path and Image byte data as sql parameters. cmd.Parameters.Add(new SqlParameter("@PictureTitle", str1));
cmd.Parameters.Add(new SqlParameter("@PictureType", str2));Stream imgStream = FileUpload.PostedFile.InputStream;
int imgLen = FileUpload.PostedFile.ContentLength;byte[] ImageBytes = new byte[imgLen]; cmd.Parameters.Add(new SqlParameter("@ImageData", ImageBytes));
//Open connection and execute insert query.
con.Open();
cmd.ExecuteNonQuery();
con.Close(); //Close form and return to list or images.
}
}
}
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error:
Line 32:
Line 33: string str2 = FileUpload.PostedFile.ContentType;
Line 34: string connectionString = WebConfigurationManager.ConnectionStrings["GSGA"].ConnectionString;
Line 35:
Line 36: //Initialize SQL Server Connection Source File: c:UsersManojDocumentsVisual Studio 2005WebSitesGSGABinaryfrmUpload.aspx.cs Line: 34
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
Binary_frmUpload.btnUpload_Click(Object sender, EventArgs e) in c:UsersManojDocumentsVisual Studio 2005WebSitesGSGABinaryfrmUpload.aspx.cs:34
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
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Aug 17, 2007
Hello All
Not sure if this is the right forum to post this question to, so if it's not, please accept my apologies.
I'm working in SQL Server 2005 with a database that was migrated to 2005 from SQL Server 2000. I have to alter a trigger on a table for some functionality changes, and when I modify the trigger and then access it through the application the database is working with, I receive this error:
There was a error in the [stored procedure name] procedure. Error Number: -2147217900 Error Description: [Microsoft][ODBC SQL Server Driver][SQL Server]The definition of object '[trigger name]' has changed since it was compiled.
[stored procedure name] and [trigger name] are where the actual names appear in the message.
I've tried running sp_recompile on the trigger, stored procedure, and table that are associated with this, and nothing works. I have dropped the trigger, which allows the save process to complete (but doesn't perform the required functionality, of course), and then re-created the trigger, but the error message still comes up. The compatibility level for the database is SQL Server 2000 (80) (as it was migrated from SQL Server 2000 as I mentioned above).
Has anyone seen this, and if so, how can I fix it?
Thanks in advance for your help!
Jay
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Dec 21, 2006
Help! I have posted this before and I had hoped that the VS2005 SP1 would help my problem. It didn't. My code is shown below. I have dropped a sqlconnection, sqldataadapter and a strongly-typed dataset from the toolbox onto the component designer for my page and written my code. It compiles without any errors but at runtine I receive the system error "Object reference not set to an instance of an object." The error occurs at the first line where the sqldataadapter is mentioned. I have shufflled the code and the error still occurs at first mention of the dataadapter. I have set parameters to a simple string such as "myemail." It hasn't helped. I have used the "Dim" statement as "Dim DaAuthorLogin as System.Data.SqlClient.SqlDataadapter and Dim DaAuthorLogin as New ......) at the start of the private sub generated by the event requiring the data. Nothing helps. Here is my simple code to select data from a sqlserver 2000 database. Why do I continue to get this error?
Partial Class AuthorLogin
Inherits System.Web.UI.Page
Protected WithEvents AuthorInformation As System.Web.UI.Page
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.SqlSelectCommand1 = New System.Data.SqlClient.SqlCommand
Me.DaAuthorLogin = New System.Data.SqlClient.SqlDataAdapter
Me.MDData = New System.Data.SqlClient.SqlConnection
Me.DsAuthorLogin = New MedicalDecisions.DsAuthorLogin
CType(Me.DsAuthorLogin, System.ComponentModel.ISupportInitialize).BeginInit()
'
'SqlSelectCommand1
'
Me.SqlSelectCommand1.CommandText = "SELECT AuthorAlias, AuthorEmail, AuthorPassword, LastName, PreferredName" & Global.Microsoft.VisualBasic.ChrW(13) & Global.Microsoft.VisualBasic.ChrW(10) & "FRO" & _
"M T_Author" & Global.Microsoft.VisualBasic.ChrW(13) & Global.Microsoft.VisualBasic.ChrW(10) & "WHERE (AuthorEmail = @AuthorEmail) AND (AuthorPassword =" & _
" @AuthorPassword)"
Me.SqlSelectCommand1.Connection = Me.MDData
Me.SqlSelectCommand1.Parameters.AddRange(New System.Data.SqlClient.SqlParameter() {New System.Data.SqlClient.SqlParameter("@AuthorEmail", System.Data.SqlDbType.NVarChar, 50, "AuthorEmail"), New System.Data.SqlClient.SqlParameter("@AuthorPassword", System.Data.SqlDbType.NVarChar, 50, "AuthorPassword")})
'
'DaAuthorLogin
'
Me.DaAuthorLogin.SelectCommand = Me.SqlSelectCommand1
Me.DaAuthorLogin.TableMappings.AddRange(New System.Data.Common.DataTableMapping() {New System.Data.Common.DataTableMapping("Table", "T_Author", New System.Data.Common.DataColumnMapping() {New System.Data.Common.DataColumnMapping("AuthorAlias", "AuthorAlias"), New System.Data.Common.DataColumnMapping("AuthorEmail", "AuthorEmail"), New System.Data.Common.DataColumnMapping("AuthorPassword", "AuthorPassword"), New System.Data.Common.DataColumnMapping("LastName", "LastName"), New System.Data.Common.DataColumnMapping("PreferredName", "PreferredName")})})
'
'MDData
'
Me.MDData.ConnectionString = "Data Source=CIS1022DAVID;Initial Catalog=CGData;Integrated Security=True;Pooling" & _
"=False"
Me.MDData.FireInfoMessageEventOnUserErrors = False
'
'DsAuthorLogin
'
Me.DsAuthorLogin.DataSetName = "DsAuthorLogin"
Me.DsAuthorLogin.SchemaSerializationMode = System.Data.SchemaSerializationMode.IncludeSchema
CType(Me.DsAuthorLogin, System.ComponentModel.ISupportInitialize).EndInit()
End Sub
Friend WithEvents SqlSelectCommand1 As System.Data.SqlClient.SqlCommand
Friend WithEvents MDData As System.Data.SqlClient.SqlConnection
Friend WithEvents DaAuthorLogin As System.Data.SqlClient.SqlDataAdapter
Friend WithEvents DsAuthorLogin As MedicalDecisions.DsAuthorLogin
'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs)
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
'no code here
End Sub
Private Sub AuthorLoginRegister_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorLoginRegister.Click
'for new author registration
Response.Redirect("AuthorInformation.aspx")
End Sub
Private Sub AuthorLoginBack_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorLoginBack.Click
'to navigate back
Response.Redirect("MainPaths.aspx")
End Sub
Protected Sub AuthorLoginPassword_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorLoginPassword.TextChanged
'pass the parameters to the dataadapter and return dataset
DaAuthorLogin.SelectCommand.Parameters("@AuthorEmail").Value = AuthorLoginEmail.Text
DaAuthorLogin.SelectCommand.Parameters("@AuthorPassword").Value = AuthorLoginPassword.Text
MDData.Open()
DaAuthorLogin.Fill(DsAuthorLogin, "T_Author")
MDData.Close()
'set session objects
If DsAuthorLogin.T_Author.Rows.Count > 0 Then
Session("AuthorAlias") = DsAuthorLogin.T_Author(0).AuthorAlias
Session("LastName") = DsAuthorLogin.T_Author(0).LastName
Session("PreferredName") = DsAuthorLogin.T_Author(0).PreferredName
Response.Redirect("AuthorPaths.aspx")
Else : AuthorLoginNotValid.Visible = True
AuthorLoginEmail.Text = ""
AuthorLoginPassword.Text = ""
End If
End Sub
End Class
Thanks in advance,
David
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Sep 12, 2006
Anyone know what this error means and how to get rid of it?
Public Sub Main()
Dim myMessage As Net.Mail.MailMessage
Dim mySmtpClient As Net.Mail.SmtpClient
myMessage.To(20) = New Net.Mail.MailAddress(me@hotmail.com)
myMessage.From = New Net.Mail.MailAddress(someone@microsoft.com)
myMessage.Subject = "as;dlfjsdf"
myMessage.Priority = Net.Mail.MailPriority.High
mySmtpClient = New Net.Mail.SmtpClient("microsoft.com")
mySmtpClient.Send(myMessage)
Dts.TaskResult = Dts.Results.Success
End Sub
Thanks,
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Mar 17, 2008
Hi,
I am trying to develop a custom algorithm. I have implemented and tested training methods, however I fail at prediction phase. When I try to run a prediction query against a model created with my algorithm I get:
Executing the query ...
Obtained object of type: Microsoft.AnalysisServices.AdomdClient.AdomdDataReader
COM error: COM error: DMPluginWrapper; Object reference not set to an instance of an object..
Execution complete
I know this is not very descriptive, but I have seen that algorith doesn't even executes my Predict(..) function (I can test this by logging to a text file)
So the problem is this, when I run prediction query DMPluginWrapper gives exception -I think- even before calling my custom method.
As I said it is not a very descriptive message but I hope I have hit a general issue.
Thanks...
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Apr 2, 2008
I am trying to send some data back to our as/400 from SQL server. Before I do so I need to delete entries from the table. I have an odbc connection set up and have used it sucessfully in a datareader compoenent but but when I try to use it for a delete SQL task it give me the followign error. what am I doing wrong? I even tried hardcoding in the system name/library name.
Here is my delete sql script
DELETE FROM DSSCNTL Where Companycode = 10
TITLE: SQL Task
------------------------------
Object reference not set to an instance of an object.
------------------------------
BUTTONS:
OK
------------------------------
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Feb 15, 2007
When I try and run Report Builder Reports i get this error message "Object reference not set to an instance of an object. "
I can run reports locally but not from Report manager
here is the stack trace info
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
Microsoft.Reporting.WebForms.WebRequestHelper.GetExceptionForMoreInformationNode(XmlNode moreInfo, XmlNamespaceManager namespaces) +18
Microsoft.Reporting.WebForms.WebRequestHelper.ExceptionFromWebResponse(Exception e) +358
Microsoft.Reporting.WebForms.ServerReport.ServerUrlRequest(Boolean isAbortable, String url, Stream outputStream, String& mimeType, String& fileNameExtension) +482
Microsoft.Reporting.WebForms.ServerReport.InternalRender(Boolean isAbortable, String format, String deviceInfo, NameValueCollection urlAccessParameters, Stream reportStream, String& mimeType, String& fileNameExtension) +958
Microsoft.Reporting.WebForms.ServerReportControlSource.RenderReport(String format, String deviceInfo, NameValueCollection additionalParams, String& mimeType, String& fileExtension) +84
Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response) +143
Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context) +75
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +154
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210
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