SqlConnection Server Error
Dec 6, 2006
I am having a hard time finding information about this error
online. I was hoping someone could help me with it. I am working with
MS Visual Studio 2005. The SQL Server version is 2000. The error
bellow says I am trying to connect to SQL 2005. Also, I can use MSVS
Server Explorer and SQL Server Enterprise Manager to connect to the
database.
Here is my code:
imports System.data
Dim Connect As New SqlClient.SqlConnection
Dim Adapter As New SqlClient.SqlDataAdapter
Dim St As New DataSet
Dim ConnectString As String
ConnectString = "Data Source=MANDB01;Initial Catalog=MANCON_WEB;Integrated Security=True"
Connect.ConnectionString = ConnectString
Adapter.SelectCommand = New SqlClient.SqlCommand("select * from item_cat1", Connect)
Adapter.SelectCommand.Connection.Open()
Adapter.Fill(St)
Connect.Close()
The browser is reporting this error:
An error has occurred while establishing a connection to
the server. When connecting to SQL Server 2005, this failure may be
caused by the fact that under the default settings SQL Server does not
allow remote connections. (provider: Named Pipes Provider, error: 40 -
Could not open a connection to SQL Server)
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Jan 4, 2008
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
this problem occured when i rum my program which contain database connection
any one there can help me please?
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Mar 10, 2008
I'm a noob to sql ce 3.5 and am getting the error "Type SqlConnection is not defined". I'm thinking this has something to do with the sql client not being installed but am not sure. I've tried adding - 'Imports System.Data.SqlClient' but it's not available, anyone ahave any ideas on how to fix this?
Thanks,
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Jul 17, 2006
This is my code in vb.net with Sql transactionI am using insertcommand and update command for executing the sqlqueryin consecutive transactions as follows.How can I achive parallel transactions in sql------------------start of code---------------------trybID = Convert.ToInt32(Session("batchID")) strSQL = "" strSQL = "Insert into sessiondelayed (batchid,ActualEndDate) values (" & bID & ",'" & Format(d1, "MM/dd/yyyy") & "')"
sqlCon = New System.Data.SqlClient.SqlConnection(ConfigurationSettings.AppSettings("conString"))
Dim s1 As String = sqlCon.ConnectionString.ToString sqlDaEndDate = New System.Data.SqlClient.SqlDataAdapter("Select * from sessiondelayed", sqlCon) dsEndDate = New DataSet sqlDaEndDate.Fill(dsEndDate)
dbcommandBuilder = New SqlClient.SqlCommandBuilder(sqlDaEndDate)
'sqlCon.BeginTransaction() 'sqlDaEndDate.InsertCommand.Transaction = tr If sqlCon.State = ConnectionState.Closed Then sqlCon.Open() End If sqlDaEndDate.InsertCommand = sqlCon.CreateCommand() tr = sqlCon.BeginTransaction(IsolationLevel.ReadCommitted) sqlDaEndDate.InsertCommand.Connection = sqlCon sqlDaEndDate.InsertCommand.Transaction = tr sqlDaEndDate.InsertCommand.CommandText = strSQL sqlDaEndDate.InsertCommand.CommandType = CommandType.Text
sqlDaEndDate.InsertCommand.ExecuteNonQuery() tr.Commit() sqlDaEndDate.Update(dsEndDate) sqlCon.Close() End If Catch es As Exception
Dim s2 As String = es.Message If sqlCon.State = ConnectionState.Closed Then sqlCon.Open() End If strSQL = " update SessionDelayed set ActualEndDate= '" & Format(d1, "MM/dd/yyyy") & "' where batchid=" & bID & "" sqlDaEndDate.UpdateCommand = sqlCon.CreateCommand() tr1 = sqlCon.BeginTransaction(IsolationLevel.ReadCommitted) sqlDaEndDate.UpdateCommand.Connection = sqlCon sqlDaEndDate.UpdateCommand.Transaction = tr1 sqlDaEndDate.UpdateCommand.CommandText = strSQL sqlDaEndDate.UpdateCommand.CommandType = CommandType.Text sqlDaEndDate.UpdateCommand.ExecuteNonQuery() tr1.Commit() sqlDaEndDate.Update(dsEndDate) sqlCon.Close()
End Try
'-------------End----------------
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Feb 16, 2008
CSharp:SqlConnection Con = new SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True"); its give ErrorUnrecognized escape sequence
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Feb 14, 2006
I am currently using VWD. I only run my web applications with the Cassini. However, as long as I want to hardcode with SqlConnection object, an error occurs. I did a little bit modification to the following codes which use SqlConnection and was quoted from the book "Professional ASP.NET 2.0", Wrox. <%@ Page Language="VB" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.SqlClient" %> <%@ Import Namespace="System.Configuration" %> <script runat="server"> Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) If Not Page.IsPostBack Then Dim MyConnection As SqlConnection Dim MyCommand As SqlCommand Dim MyReader As SqlDataReader MyConnection = New SqlConnection() MyConnection.ConnectionString = ConfigurationManager.ConnectionStrings("ASPNETDB").ConnectionString MyCommand = New SqlCommand() MyCommand.CommandText = "SELECT TOP 3 * FROM Paspnet_Users" MyCommand.CommandType = CommandType.Text MyCommand.Connection = MyConnection MyCommand.Connection.Open() MyReader = MyCommand.ExecuteReader(CommandBehavior.CloseConnection) gvCustomers.DataSource = MyReader gvCustomers.DataBind() MyCommand.Dispose() MyConnection.Dispose() End If End Sub </script> <html> <body> <form id="form1" runat="server"> <div> <asp:GridView ID="gvCustomers" runat="server"> </asp:GridView> </div> </form> </body> </html> The error: System.NullReferenceException was unhandled by user code Message="Object reference not set to an instance of an object." Source="App_Web_v1u8yf_l" StackTrace: at ASP.sqlconnectiontest_aspx.Page_Load(Object sender, EventArgs e) in F:My DocumentMy StudySITMT4Introduction to ASP.NetMeowMeowShoppingCartSQLconnectionTest.aspx:line 13 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Please help me find out what's the problem. Thanks beforehand.
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Apr 17, 2008
I defined the following connection string (strConn) and coded "Dim oConn As New SqlConnection(strConn)".In this VS 2005/ASP.net 2.0 program, 'SqlConnection' was underlined and showed 'Type SqlConnection is not defined' error.
What wrong with my VS 2005/ASPnet 2.0 coding, or SQL Server 2000 database configuration?
TIA,Jeffrey
connectionString="Data Source=webserver;Initial Catalog=Ssss;Persist Security Info=True;User ID=WWW;Password=wwwwwwww"providerName="System.Data.SqlClient"
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Sep 25, 2007
I'm attempting to create an ASP page that generates a report from a user-selected table on a user-selected server. Is it possible to employ a variable to define the "server=" attribute in the SqlConnection method, and what would the syntax be? Thanks.
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Dec 13, 2007
My web project (ASP.NET 2.0 / C#) runs against sql server 2000 and uses the System.Data.SqlClient.using System.Data.SqlClient;
I use System.Data.SqlClient.SqlConnection and System.Data.SqlClient.SqlCommand to make the connections to the database and do selects and updates. Is it correct to continue to use these against SQL Server 2005? I ask because I made a connection string (outside of .Net) for SqlServer 2005 using the SQL native provider and it had the following - Provider=SQLNCLI.1 and any connection strings I had made (also outside of ASP.NET) fro SQL Server all used Provider=SQLOLEDB.1. This is why I wondered if there is a different SqlClient in .Net 2.0 for SQL Server 2005?
Cheers
Al
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Feb 21, 2006
Hi,I have a SqlConnection object with connection string, "Data Source=server1;Initial Catalog=CDCollection;User Id=joe;Password=11111."For User ID, I created a new user "joe" in the Management Studio.I tried to use this user, but sqlconnection threw an exception stating access was denied.I noticed that SQL Server 2005 has user accounts that you can create for the server and for the database, but I am confused by this. How can a create a non-sa user account that I can give to the SQLConnection object that will work? Do I need to create a user for the server and the same user for the database CDCollection? I am not all familiar with SQL Server administration.Any help or leads would be appreciated.
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Apr 23, 2007
I have lots of problems with the connection. I've connected many dropdownlists to the database and i didn't have problems at all. I also try an example of an ASP.NET book:
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString= "<%$ ConnectionStrings:CIPPEC%>"
InsertCommand=
"INSERT INTO
[member] ([first_name], [last_name], [malefemale], [yearborn])
VALUES
(@first_name, @last_name, @malefemale, @yearborn)">
<InsertParameters>
<asp:FormParameter Name="first_name" Type="String"
FormField="FirstTextBox" />
<asp:FormParameter Name="last_name" Type="String"
FormField="LastTextbox"/>
<asp:FormParameter Name="malefemale" Type="Int32"
FormField="MFRadioButton" />
<asp:FormParameter Name="yearborn" Type="Int32"
FormField="YearDropDown" />
</InsertParameters>
</asp:SqlDataSource>
And it worked well. But when i try to connect my page with:
Dim connect As New Data.SqlClient.SqlConnection( _
"Server=glgrand-arSQLEXPRESS;UID="WindowsStartupUser";password="WindowsStartupPass"; database=CIPPEC")
connect.Open()
Dim cmd As New Data.SqlClient.SqlCommand( _
"INSERT PRUEBA (PersonaJuridica, NombreRazonSocial, Nombre, Segundo_nombre, Apellido) " & _
"VALUES (txtPerJur, txtRazSoc, txtName, txtSecondName, txtApellido)", _
connect)
cmd.ExecuteNonQuery()
connect.Close()
The error message says: Login failed for user 'username'.
I tried lots of things but it didn't work:
In SQL Configuration Manager:
Client Protocols: TCP/IP and Named Pipes are enabled.
In SQL 2005 Services: Server Properties: Built-in Account: Local System
SQL Server Surface Area Configuration: Remote connections: Using both TCP/IP and Name Pipes connection is selected.
In SQL Management Studio i created a new login glgrand-ar/UserStartupName , with sysadmin server role and user mapping my CIPPEC database.
I don't know what else i could try, i tried it at home and at work and i couldn't connect to my database and make an INSERT. It stops at Connect.Open() with the error that i wrote in this subject message.
It's evident that i'm doing something wrong (because i'm new): Could you please help me with a solution and explain me what are the data that i have to put on the Data.SqlClient.SqlConnection ?? I'm using the Windows authentication: i'm putting my username and password and it doesn't worked.
Thank you!!
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Oct 18, 2007
Hi all,
In the Object Explorer of my SQL Server 2005 Management Studio Express, I do not have €˜Northwind€™ Database installed yet. I executed the following source code (that was copied from a book) in my VB 2005 Express:
/////////////////////----Form9.vb----//////////////////////////
Imports System.Data.SqlClient
Imports System.Data
Public Class Form9
Dim cnn1 As New SqlConnection
Private Sub Form5_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Compute top-level project folder and use it as a prefix for
'the primary data file
Dim int1 As Integer = InStr(My.Application.Info.DirectoryPath, "bin")
Dim strPath As String = Microsoft.VisualBasic.Left(My.Application.Info.DirectoryPath, int1 - 1)
Dim pdbfph As String = strPath & "northwnd.mdf"
Dim cst As String = "Data Source=.sqlexpress;" & _
"Integrated Security=SSPI;" & _
"AttachDBFileName=" & pdbfph
cnn1.ConnectionString = cst
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Create a command to create a table
Dim cmd1 As New SqlCommand
cmd1.CommandText = "CREATE TABLE FromExcel (" & _
"FirstName nvarchar(15), " & _
"LastName nvarchar(20), " & _
"PersonID int Not Null)"
cmd1.Connection = cnn1
'Invoke the command
Try
cnn1.Open()
cmd1.ExecuteNonQuery()
MessageBox.Show("Command succeeded.", "Outcome", _
MessageBoxButtons.OK, MessageBoxIcon.Information)
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
cnn1.Close()
End Try
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'Create a command to drop a table
Dim cmd1 As New SqlCommand
cmd1.CommandText = "DROP TABLE FromExcel"
cmd1.Connection = cnn1
'Invoke the command
Try
cnn1.Open()
cmd1.ExecuteNonQuery()
MessageBox.Show("Command succeeded.", "Outcome", _
MessageBoxButtons.OK, MessageBoxIcon.Information)
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
cnn1.Close()
End Try
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
'Declare FromExcel Data Table and RowForExcel DataRow
Dim FromExcel As New DataTable
Dim RowForExcel As DataRow
FromExcel.Columns.Add("FirstName", GetType(SqlTypes.SqlString))
FromExcel.Columns.Add("LastName", GetType(SqlTypes.SqlString))
FromExcel.Columns.Add("PersonID", GetType(SqlTypes.SqlInt32))
'Create TextFieldParser for CSV file from spreadsheet
Dim crd1 As Microsoft.VisualBasic.FileIO.TextFieldParser
Dim strPath As String = _
Microsoft.VisualBasic.Left( _
My.Application.Info.DirectoryPath, _
InStr(My.Application.Info.DirectoryPath, "bin") - 1)
crd1 = My.Computer.FileSystem.OpenTextFieldParser _
(My.Computer.FileSystem.CombinePath(strPath, "Book1.csv"))
crd1.TextFieldType = Microsoft.VisualBasic.FileIO.FieldType.Delimited
crd1.Delimiters = New String() {","}
'Loop through rows of CSV file and populate
'RowForExcel DataRow for adding to FromExcel
'Rows collection
Dim currentRow As String()
Do Until crd1.EndOfData
Try
currentRow = crd1.ReadFields()
Dim currentField As String
Dim int1 As Integer = 1
RowForExcel = FromExcel.NewRow
For Each currentField In currentRow
Select Case int1
Case 1
RowForExcel("FirstName") = currentField
Case 2
RowForExcel("LastName") = currentField
Case 3
RowForExcel("PersonID") = CInt(currentField)
End Select
int1 += 1
Next
int1 = 1
FromExcel.Rows.Add(RowForExcel)
RowForExcel = FromExcel.NewRow
Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
MsgBox("Line " & ex.Message & _
"is not valid and will be skipped.")
End Try
Loop
Try
cnn1.Open()
Using sqc1 As SqlBulkCopy = New SqlBulkCopy(cnn1)
sqc1.DestinationTableName = "dbo.FromExcel"
sqc1.WriteToServer(FromExcel)
End Using
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
cnn1.Close()
End Try
'Read the FromExcel table and display results in
'a message box
Dim strQuery As String = "SELECT * " & _
"FROM dbo.FromExcel "
Dim str1 As String = ""
Dim cmd1 As New SqlCommand(strQuery, cnn1)
cnn1.Open()
Dim rdr1 As SqlDataReader
rdr1 = cmd1.ExecuteReader()
Try
While rdr1.Read()
str1 += rdr1.GetString(0) & ", " & _
rdr1.GetString(1) & ", " & _
rdr1.GetSqlInt32(2).ToString & ControlChars.CrLf
End While
Finally
rdr1.Close()
cnn1.Close()
End Try
MessageBox.Show(str1, "FromExcel")
End Sub
End Class
///////////////////////////////////////////////////////////////////////
This is Part 1 (The length of input exceeds 50000 characters). Part 2 will be posted in this site shortly.
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Jul 27, 2006
Public Conn As New SqlConnection("Data Source=localhost;Initial Catalog=tblUsers;UID=XXXX;pwd=XXXX")Public Conn As New SqlConnection("Data Source=XX.XXX.XX.XXX;Initial Catalog=tblUsers;UID=XXXX;pwd=XXXX")
This two commands are in my application. I switch between the two so I can test my application.
When I put my application on the server, I use the localhost SQLCONNECTION. The other is commented out. However, the application continues to connect to the server with the address that is commented out.
THIS IS VERY FRUSTRATING... HELP!!!!
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Oct 2, 2006
Hi, Someone can explain to me what happend in this situation...i have this and want to call a procedure with connection parameters protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection edo = new SqlConnection();
edo.ConnectionString = "server=myserver; uid=admin; pwd=; " +
"database=name1";
SqlCommand com = edo.CreateCommand();
com.CommandType = CommandType.Text;
My_proc(edo, com);
}
protected void My_proc(SqlConnection edo , SqlCommand com)
{
try
{edo.Open();
}
catch{}
finally{ edo.close();}
}
Well what happend with the SqlCommand and SqlConnection when return to Button_Click() Are they alive? Can be used in Buton_Click like parameters for another procedure? or i have to create it again?Thx in advance..
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Oct 16, 2006
please help me !!!?I have a problem with sqlconnection definition when I add the sqlconnection from toolbox :like this: Imports System.Data.SqlClientPartial Class _Default Inherits System.Web.UI.Page Private Sub InitializeComponent() Me.sqlConnection1 = New System.Data.SqlClient.SqlConnection Me.sqlConnection1.ConnectionString = "Data Source=server;Initial Catalog=masterstd;User ID=sa" Me.sqlConnection1.FireInfoMessageEventOnUserErrors = False End Sub Private WithEvents sqlConnection1 As System.Data.SqlClient.SqlConnection Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then Dim cmduniversity As SqlCommand Dim dtruniversity As SqlDataReader cmduniversity = New SqlCommand("select * from university", sqlConnection1) sqlConnection1.Open() dtruniversity = cmduniversity.ExecuteReader dtruniversity.Close() sqlConnection1.Close() End If End SubEnd Classin the sqlconnection.open the nullrefrence exception occures butwhen i define myself this exception dosn't occure.like this: Imports System.Data.SqlClientPartial Class _Default Inherits System.Web.UI.Page Private Sub InitializeComponent() End Sub Private WithEvents sqlConnection1 As System.Data.SqlClient.SqlConnection Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then sqlConnection1 = New SqlConnection sqlConnection1.ConnectionString = "Data Source=server;Initial Catalog=masterstd;User ID=sa" sqlConnection1.FireInfoMessageEventOnUserErrors = False Dim cmduniversity As SqlCommand Dim dtruniversity As SqlDataReader cmduniversity = New SqlCommand("select * from university", sqlConnection1) sqlConnection1.Open() dtruniversity = cmduniversity.ExecuteReader dtruniversity.Close() sqlConnection1.Close() End If End Subwhere is the problem?
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Apr 28, 2007
Can someone help me out? I am trying to establish a SQL server connection in my C# code. My C# code crasheds though. Can someone tell me what Iam doing wrong? Here is the C# code:
SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["TheDividerConnectionString"]);
Here is the connection string as defined in the web.config file:
<connectionStrings> <add name="TheDividerConnectionString" connectionString="Data Source=BVCOMPUTERSQLEXPRESS;Initial Catalog=TheDivider;Integrated Security=True" providerName="System.Data.SqlClient" /> </connectionStrings>
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Jun 11, 2007
is their any code which can check my project for any connections which are open and never closed.
frm 1.1,sql server 2000
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Jan 24, 2008
Would anyone ahve any ideas why when i debug this code, it stops and freezes at cn.open(); A raw sql query against the DB works in this format.
int top=10;SqlConnection cn = new SqlConnection("Data Source=blah;Initial Catalog=blah;Integrated Security=blah");
SqlCommand cmd = new SqlCommand("SELECT DISTINCT TOP (@nrows) [CustNu] FROM [Customer] WHERE [CustNu] like @term", cn);cmd.Parameters.AddWithValue("nrows", top);cmd.Parameters.AddWithValue("term", prefixText + "%");
List <string> suggestions = new List<string>();
cn.Open();
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Mar 13, 2008
HiI would like to have some help for my problem.I'm trying to retreive the connectionString "MyConnectionString" from app.config using method 1 or 2 to get a connection to my DB (without any success.) --> Partial codepublic SqlConnection GetConnection() { // reference to System.Configuration Library is done 1 SqlConnection Connection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);--> thrown NullReferenceException on Conn.Open(); 2 SqlConnection Connection = new SqlConnection(ConfigurationSettings.AppSettings["MyConnectionString"]);--> thrown InvalidOperationException ConnectionString not initialised return Connection; } public Contest GetContestFromDB() { SqlConnection Conn = GetConnection(); Conn.Open(); ->> thrown Exception 1 or 2...Here my app.config :<?xml version="1.0" encoding="utf-8"?><configuration> <appSettings> <clear/> <add key="MyConnectionString" value="Server=.SQLExpress;AttachDbFilename=D:Documents and Settings0xMesdocumentsApp_DataShopperDB.MDF;Database=ShopperDB.MDF;Trusted_Connection=Yes;"></add> </appSettings> <connectionStrings> <clear/> --> using <clear/> to avoid to load from machine.config <add name="MyConnectionString" connectionString="Server=.SQLExpress;AttachDbFilename=D:Documents and Settings0xMes documentsApp_DataShopperDB.MDF;Database=ShopperDB.MDF;Trusted_Connection=Yes;"></add> </connectionStrings></configuration> I'm using Visual Studio 2008 with SQLServer 2005 Express Embedded and WindowsXP SP2 .Have you got any idea ?I'm not able to sleep anymore...And I've test this code in ASP.net with the same ConnectionString in the web.config file and it works !!I'm lost.By the way, thx if ou get an answer ww4ss
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Aug 24, 2004
Hi
I have the next simple code, what do i have to change to match it to SQL?
The code:
Sub Page_Load (Source As Object, E as EventArgs)
dim strConn as string =("Provider=" & "Microsoft.Jet.OLEDB.4.0;" & _
"Data Source =C:webspacesegolforferaforfera.co.ildbguestbook.mdb")
Dim MySQL as string = "SELECT Name, EMail, URL, Comment FROM Guestbook"
Dim MyConn as New OleDBConnection (strConn)
Dim Cmd as New OleDBCommand (MySQL, MyConn)
MyConn.Open ()
rptGuestbook.DataSource = Cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
rptGuestbook.DataBind()
End Sub
Thank's and have a good day.
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Jul 17, 2006
I have a database for each of my customers and want to connect to a database depending on who is logged in.
all my users have their database name in the user profile.
how can i use the database name in the user profile to change the initial catalog to connect to aaother database?
thanks
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Nov 16, 2006
Hi there, I'm not sure if the way I handle SqlConnection in my apps is the most performant one.So my apps use db heavily and there are loads of classes with methods like 1 using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["myConn"].ConnectionString))
2
3 {conn.Open();
4 // more code here
5 }
6
7
As I use using the connection is closed and the object is disposed when leaving the code block.I know that the connection is taken from a pool and when closed it returns to the pool as though I'm not sure if it is better to have one "global" SqlConnection objectand to use that object for all classes or most of them. What about the ConfigurationManager, doesn't it slow down the performance as well when I'm accessing the ConnectionString value thousands of times?I hope someone can point out the issues.Many thanks in advance, Limbic
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Jan 3, 2007
I need some information on sqlconnnection object. I see it referenced in some exercises, and also displayed in the toolbox on some articles, but I'm running .net 2.0 and I have no sqlconnection in my toolbox, but more importantly, I can not seem to drop the data connection from my database/server explorer to my form to create a sqlconn object. When I highlight the data connection (in my case it's machinenamesqlexpress.pubs.dbo) and try to drag it - it immediately goes to a NO icon (that is a circle with a slash thru it) and I can not drop it onto my form. I can see the database with no problems in explorer.
I have been able to create a sqlconnection programatically:
Dim sqldatasource1 As SqlConnection = New SqlConnection()
sqldatasource1.ConnectionString = "Data Source=localhostsqlexpress;Initial Catalog=pubs;Integrated Security=True"
but how can I create it on my form?? I would appreciate any help on this matter.
(p.s. I am using VWD 2005 and SQLExpress)
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Jul 30, 2007
I have created an aspx page that uses the SqlConnection class to pull data from Microsoft CRM’s database, and we have placed this aspx inside CRM’s directory on the server so that it uses the same integrated security that CRM uses. This works fine on our test environment but on our live environment the Sql connection fails with the exception: "Not associated with a trusted SQL Server connection"
This is probably because our test CRM server has the database on the same machine as the web server, but the live environment has the database and the web server on separate machines.
So my question is how can I create an aspx page that takes the integrated security credentials that the user used to log into the website and uses them to access data from a database on a seperate machine?
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Oct 26, 2007
Hi,When using the following controls....System.Data.SqlClient.SqlConnection System.Data.SqlClient.SqlCommandIf I want to change my SQL command and execute the query once again what cleanup do I need to do first?Do I need close and dispose the SqlConnection?Do I need to dispose the SqlCommand?Can I use the SqlConnection for more than one SqlCommand?Thanks,Scott
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Dec 18, 2007
I am working on a set of webforms that insert user data into a set of db tables.
I set up a test of an approach using northwind and I'm having trouble getting the insert to work. When I open the form, input the name and phone, and submit there is no error, but no record inserted into the Shippers table.
You can see one of my approaches in the ASPX code. I don't like having to do the select in order to do the insert -- so that's commented off.
I'm stuck. Thoughts about what I'm missing appreciated...
Ray
ASPX code.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default66a.aspx.cs" Inherits="pages_audit_Default66a" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server"><title>Untitled Page</title>
</head><body>
<form id="form1" runat="server">
CompanyName:
<asp:textbox id="txtCompanyName" runat="server" /><br />
Phone:<asp:textbox id="txtPhone" runat="server" /><br />
<br />
<asp:button id="btnSubmit" runat="server" text="Submit" onclick="btnSubmit_Click" />
<br />
<br />
<br />
<br />
<asp:Label ID="awesomelbl" runat="server" Text="Label"></asp:Label><br />
<br />
<!--
<asp:sqldatasource id="SqlDataSource1" runat="server" connectionstring="<%$ ConnectionStrings:NorthwindConnectionString %>"
insertcommand="INSERT INTO Shippers(CompanyName, Phone) VALUES (@CompanyName, @Phone)" ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM [Shippers]">
<insertparameters>
<asp:controlparameter controlid="txtCompanyName" name="CompanyName" />
<asp:controlparameter controlid="txtPhone" name="Phone" />
</insertparameters>
</asp:sqldatasource>
--></form>
</body>
</html>
c Sharp code
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.Sql;
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;
public partial class pages_audit_Default66a : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{
}protected void btnSubmit_Click(object sender, EventArgs e)
{SqlConnection con = new SqlConnection("Data Source=Chilibowl;Trusted_Connection=yes;DataBase=Northwind");
SqlCommand cmd = new SqlCommand("INSERT INTO [Shippers] ([CompanyName], [Phone]) VALUES (@CompanyName, @Phone)");SqlParameter cnameparam = new SqlParameter("@CompanyName", txtCompanyName.Text); SqlParameter phnparam = new SqlParameter("@Phone", txtPhone.Text);
cmd.Parameters.Add(cnameparam);
cmd.Parameters.Add(phnparam);
try
{
con.Open();if (cmd.ExecuteNonQuery() > 0)awesomelbl.Text = "successful insert";
}
catch
{
//handel
}
finally
{
con.Close();
}
}
}
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Nov 12, 2003
Hi all,
I am accessing one database a bunch of different times all throughout my code...in various functions and different web pages. Is there a a way to create an sqlconnection that I can access all the time, instead of constanting hardcoding which database to go to? I've tried putting the info in another file and just including it where I want the database to open, but I can't use <!-- #INCLUDE --> inside of the server scripts.
Can anyone help
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Jan 22, 2004
Hi,
How much of a performance difference is there between connecting to SQL Server 2000 using OleDbConnection or using SqlConnection?
The reason I'm asking is I am taking on the task of updating an older program that uses a Access Database to use SQL Server, but it has a Database Utility class that uses OleDbConnection. I'm just debating whether it would be worthwhile to upgrade the class to use the SQL objects rather than Oledb. Program does a lot of update and insert of invidual records, and a few select statements that usually return from 1 to 2000 records up to a maximum of 50,000 records
Thanks
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Mar 2, 2004
I've an web app with impersonate windows authentication. IIS uses Windows authentication for this app & anonymous authentication is turned off.
This app have connectionString in Web.config where Windows autentication (SSPI) to SQL Server 2000 took place.
Now I've a piece of code:
public class SiteParameters
{
public static SqlConnection Connection
{
get
{
SqlConnection conn;
try
{
conn = new SqlConnection(ConfigurationSettings.AppSettings["connectionString"]);
if(conn.State != ConnectionState.Open)
conn.Open();
}
catch(Exception)
{
conn = null;
}
return conn;
}
}
}
No comments is needed, think...
Now, I'm going to use it in following way:
SqlConnection conn = SiteParameters.Connection;
SqlDataAdapter dta = new SqlDataAdapter();
DataSet ds = new DataSet();
SqlCommand sqlSelect = new SqlCommand("spPlanTransportSelect", conn);
sqlSelect.CommandType =CommandType.StoredProcedure;
dta.SelectCommand = sqlSelect;
dta.Fill(ds, "PlanTransport");
if(conn.State != ConnectionState.Closed)
conn.Close();
return ds;
It looks good & works good... on local machine only :( When I run app locally (doesn't matter if I call it by http://localhost/app, http://127.0.0.1/app or http://10.50.2.51/app I take proper data from database.
But when my buddy from another comp (e.g. 10.50.2.52) uses URL http://10.50.5.51/app he receives an error in line dta.Fill(ds, "PlanTransport");, but in fact conn variable is null & he receives "yellow" screen where is written that NT ANONYMOUS user is trying to log on to database...
It looks strange for me. Any tips?
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Jul 10, 2004
I tried connected my web form with SQL server by drag a table from Server Explore onto the WebForm1.aspx. page. It created a sqlConnection1 and a sqlDataadapter object, but theses two objects seem not work. There is nothing displayed on property window and when I right-click sqlDataAdapter there is no "Preview Data", "Configure Data Adapter" and "Gnerate Dataset" items displayed as well.
I used this SQL server on Windows Form, it worked very well. Could anyone please help me figure it out. Thanks!
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Sep 23, 2004
Hello all,
Actually i want to known, is their any method or property in SqlConnection class which will return some value, so that through which we become confirm that connection has established.
Thanks in advance!
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Oct 28, 2004
Hi !!
I have a code that runs from a different machine and a different site and i am facing a problem that i can not log in to the database.I installed SQL Server on my machine and I created a user "fadila" and SQL Server Authentication and the password is "fadil1977" and the database is "otters" and it is installed as tables and stored procedures but there is not data on these tables.
I used the method provided in the code so, i only change the "connStr" in one place rather than in 20 places and my code is as below. Can you please Help me to connect to the database. I Really..Really appreciate it if you help me to solve it as it causeing me a big head-ache and still get the error message "SQL Server does not exist or access denied" .. please help!!!!
Friend Shared ReadOnly Property connStr() As String
Get
Return String.Format( _
"Data Source={0};Initial Catalog=Otters;User ID=fadila;Password=fadil1977", _
DatabaseMachine)
End Get
End Property
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May 18, 2005
If i use the TimeTracker app from the starter kit suite and I enter my SQL connection in the web.config file it works fine,
If i build a simple app with just a sqladapter, sqlconnection and dataset control then enter in the page_load procedure
sqlDataAdater1.fill(dataset11)
datagrid1.databind()
It keeps giving my errors see below: I created a connection with the sqlconnection control and used the same userid and password I used in the time tracker stater kit's web config file which works - I have no idea what is going on
*** is it better to create the sqlconnection control first then create the sqladapter or vise versa.
Server Error in '/WebApplication2' Application.
Login failed for user 'IssueTrackerUser'.
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.Data.SqlClient.SqlException: Login failed for user 'IssueTrackerUser'.Source Error:
Line 55: Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Line 56: 'Put user code to initialize the page here
Line 57: SqlDataAdapter1.Fill(DataSet11)
Line 58: DataGrid1.DataBind()
Line 59: Source File: c:inetpubwwwrootWebApplication2WebForm1.aspx.vb Line: 57 Stack Trace:
[SqlException: Login failed for user 'IssueTrackerUser'.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction)
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)
System.Data.SqlClient.SqlConnection.Open()
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
WebApplication2.WebForm1.Page_Load(Object sender, EventArgs e) in c:inetpubwwwrootWebApplication2WebForm1.aspx.vb:57
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()
Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573
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