Connecting To SQL Database With VB.net

Feb 20, 2008

I'm completely new to this, so as much detail as you can provide is appreciated.

I have a SQL database called "WebDesk.mdf" and I have a ASP.Net web application. I can't figure out the connection string I need to connect to this database. It doesn't matter if I connect to it as a file, or otherwise.

Please tell me all the steps I need to get the connection string.

-Dan

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Right Code Statements Of SqlConnection && ConnectionString For Connecting A Database In Database Explorer Of VB 2005 Express?

Feb 14, 2008

Hi all,

In the VB 2005 Express, I can get the SqlConnection and ConnectionString of a Database "shcDB" in the Object Explorer of SQL Server Management Studio Express (SSMSE) by the following set of code:
///--CallshcSpAdoNetVB2005.vb--////

Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.SqlTypes

Public Class Form1

Public Sub InsertNewFriend()

Dim connectionString As String = "Data Source=.SQLEXPRESS;Initial Catalog=shcDB;Integrated Security=SSPI;"

Dim connection As SqlConnection = New SqlConnection(connectionString)

Try

connection.Open()

Dim command As SqlCommand = New SqlCommand("sp_insertNewRecord", connection)

command.CommandType = CommandType.StoredProcedure
.......................................
etc.
///////////////////////////////////////////////////////
If the Database "shcDB" and the Stored Procedure "sp_inertNewRecord" are in the Database Explorer of VB 2005 Express, I plan to use "Data Source=local" in the following code statements to get the SqlConnection and ConnectionString:
.........................
........................

Dim connectionString As String = "Data Source=local;Initial Catalog=shcDB;Integrated Security=SSPI;"

Dim connection As SqlConnection = New SqlConnection(connectionString)

Try

connection.Open()

Dim command As SqlCommand = New SqlCommand("sp_insertNewRecord", connection)

command.CommandType = CommandType.StoredProcedure
........................
etc.

Is the "Data Source=local" statement right for this case? If not, what is the right code statement for my case?

Please help and advise.

Thanks,
Scott Chang

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Apr 23, 2008

 Hi all,I come up with a problem aleady discussed in some posts especially in the post http://forums.asp.net/t/1235761.aspx. but I got in not finally solved.The main problem is connecting to a database twice which causes errors. So I think this might be the right place to ask my questions.  Here ist the problem in short:I'm using VWD on XP-Professional with SQL-Server Express and Reporting Services Express. All with Windwos Integrated Security and User Instance (SQLExpress). In my web-application I had for all Datasources the connect string:Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|mydatabase.mdf;Integrated Security=True;User Instance=True This works fine so far. I also have Reports designed with the Report designer using the same connection string. I can preview the reports and I deployd thre reports successfully. I want to call these report using a report viewer web control.Now the problem:when I call the remote remote report from my web-application, the database cannot be opened because an other process is using the database (see post mentioned above). It seems that this is a problem with attaching the database twice: from the sql-server and from the report-server.So I used now a new connection string without "attaching" the database (in vwd and in report designer):Data Source=.SQLExpress;Initial Catalog=C:inetpubwwwrootmyappAPP_DATAmydatabase;Integrated Security=True Now everything works...but ... only on my machine. On the production machine this does not work. I wonder anyway, why its working on my machine, because I never "attach" the database (there is no connection string with  AttachDbFilename and I have not opend the developer and have not opened the sql management studio).On the production machine the concurrent (SQL-Server and Report-Server) connection to database does not work with either connection strings, no matter if i attach the database with sql server manager or not).This all drives me crazy for days now. All I want is to use SQL-server and Reporting- Services with its nice features and not repairing my tools. I thought I have a standard Installation, nothing special, but the standard obviously makes problems.Here finally my question:Does this environment ( web-application with remote reports) with Express edition cause normally no problems?Can I "attach" a database only once?  How should I connect with my web application that uses the sql-server connections and also  the report-server-connections (attaching twice does not work).What connection strings to use and when (AttachDbFilename or Initial Catalog).Are these problems specific to the Express Editions? I thank you in advance for any help  Dieter

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Sep 24, 2007

I am very new to web development using Microsoft Visual Studio.  (my primary expertise is Framemaker 2003).  I am currently going through your ASP.NET 2.0 videos and reproducing the lesson content on my development system.  I have Microsoft Visual Studio 2005 Professional Edition.  I also have Microsoft SQL Server 2005, Microsoft SQL Server 2000, Microsoft .NET Framework SDK v1.1 and Microsoft .NET Framework SDK v2.0.
I seem to be having difficulties with the SQL interface because when I try to use the Property object from Lesson04, I get System.Web.HttpExceptioon {"Unable to connect to SQL Server database."}.  When I subsequently tried to Add New Item - SQL Database from Lesson08, I get a Microsoft Visual Studio error box "Connections to SQL Server files (*.mdf) require SQL Server Express 2005 to function properly.  Please verify the installation of the component or download from the URL: http://go.microsoft.com/fwlink/?LinkId=49251"
Any ideas?  I know the videos are based on use of the Microsoft Visual Studio Express -- are there significant configuration differences between it and Microsoft Visual Studio Professional that would make these lessons incompatible?

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Sep 26, 2007

Using web dev  and sql 2005 express
I have published web app and database to my server but can,t get connection string to connect with the database.
---------------------------------------------------------------------
Login failed for user ''. The user is not associated with a trusted SQL Server connection.
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 ''. The user is not associated with a trusted SQL Server connection.
---------------------------------------------------------------------
I have created a user in the logins   in the sql server security node and give him every permission
going.
I have also created a login  in the security node for the database..... and given him all permissions
But I still can,t get the connection string from the web app to connect to the database?
Where am I going wrong
 

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Nov 21, 2007

Hi all,
I am new to this field. I am trying to Connect to the database using the following code. The code does not give an error but gives an empty grid view.
Can somebody figure out the mistake?protected void Page_Load(object sender, EventArgs e)
{if (!IsPostBack)
BindGridView();
}void BindGridView()
{
 System.Data.SqlClient.SqlConnection sqlconnect = new System.Data.SqlClient.SqlConnection("");//added connection string here
String command = "SELECT * from table";System.Data.SqlClient.SqlCommand sqlcommand = new System.Data.SqlClient.SqlCommand();
sqlcommand.CommandText = command;
sqlcommand.Connection = sqlconnect;System.Data.SqlClient.SqlDataAdapter da = new System.Data.SqlClient.SqlDataAdapter();
da.SelectCommand = sqlcommand;DataSet ds = new DataSet();
sqlconnect.Open();
sqlcommand.ExecuteNonQuery();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
sqlconnect.Close();
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Mar 9, 2008

I have a file called upload.vb and I am having a lot of trouble figuring out how to connect to a database that I have created in my App_Data folder called myDatabase.mdf. Here is the code on for upload.vb Imports System
Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls
Imports System.IO
Imports System.Data.SqlClient

''' <summary>
''' Upload handler for uploading files.
''' </summary>
'''

Public Class Upload
Implements IHttpHandler, IReadOnlySessionState

Public Sub New()
End Sub

#Region "IHttpHandler Members"

Public ReadOnly Property IsReusable() As Boolean Implements System.Web.IHttpHandler.IsReusable
Get
Return True
End Get
End Property

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

If context.Request.Files.Count > 0 Then
' get the applications path
Dim tempFile As String = context.Request.PhysicalApplicationPath
' loop through all the uploaded files
Dim j As Integer = 0
While j < context.Request.Files.Count
' get the current file
Dim uploadFile As HttpPostedFile = context.Request.Files(j)
' if there was a file uploded
If uploadFile.ContentLength > 0 Then

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End If
System.Math.Max(System.Threading.Interlocked.Increment(j), j - 1)
End While
End If
' Used as a fix for a bug in mac flash player that makes the
' onComplete event not fire
HttpContext.Current.Response.Write(" ")
End Sub

#End Region

End Class Everytime I attempt to create a database connection I get all kinds Compiler errors. If anybody can help me understand how to connect to my database from this page I would greatly appreciate it. Thanks.

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Jun 19, 2008

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Nov 19, 2005

I have an SQL database setup but i don't know how to connect to it to set up a table.  I have a vague idea about connectionstrings and such.  I have a server name, a database name, a user id and a password.  I would like to set it up so i can just enter the SQL commands and create a table and enter data.  But first I need to connect to the database.  I

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Nov 29, 2005

I am moving my site from a shared environment to a dedicated server and SQL is on the same box. How do I connect to my database if it's on the same box?

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Apr 25, 2006

Hi all,
 
Please help me with the following problem because I am running around in circles.
 
I have this problem getting a forum online.
Since it is a database related problem which I have been trying to solve at the ClubSite forum I am taking the liberty to come to this forum with this problem.
 
This is the story:
I have this separate SQL database dotForum2004.mdf in App_data.
After trial and error got it working locally.
 
But when I put it online at my webserver (On a Stand-alone PC at my jobsite) I get an application error.(From the Club Site application)
 
This is the connection key which works fine locally. Is there something obvious you can point me at?
 
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Lex

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May 2, 2007

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here is a pic of the error I am getting:



I am using Visual WebDeveloper 2005 Express to do this in, and I can't find any options that pertain to the error above. I looked in the SQL configuration tools that I have installed, and I can't seem to find the correct options that I need.

Does anyone know how to resolve this? If you can provide direction on this, that would be great.

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May 2, 2004

Hi. I'm totally new here, and I'm not an expert when it comes to SQL, so bear with me. This is my dilemma:

I use Access 2000 to connect to my Microsoft SQL Server 2000 database. Recently, our provider switched us from a shared server to a dedicated server. The site is up and running perfectly, but I can't connect to my database via Access anymore. Once I received the new location of the database, I ran odbcad32.exe and configured the database's DSN info where appropriate. I run the "Test Data Source..." function and the tests are seemingly successful. When I open my database using Access, I'm able to log in successfully, but when I click on any one of my linked tables, I get the following error:

Could not execute query; could not find linked table.

[Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name
'NAMEOFDATABASE.NAMEOFTABLE'. (#208)

The support team at my provider are not exactly geniuses, so who knows if and when they'll be getting back to me. In the meantime, does anyone have a clue what might be causing this? Since the site is working perfectly, I assume the connection strings are okay and the database is perfectly intact (I even checked to see that the most recent entries were live), so what gives? If there's any more info I can provide, let me know. Thanks in advance.

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Jun 2, 2008

Hi, I will post this on a c# forum as well but maybe someone has an answer here.

I want to connect to my database in a program i am coding with C#.
I have 3 databases in my SQL server (DB1, DB2, DB3)(perhaps schemas is the word to use) all under a connection called TEST (as opposed to SQLEXPRESS.

My connection string in my code is as follows:
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My app reports a valid connection is made. WooHoo.
But,
When i try to do a select statement eg: Select * from DB1.Customers
I get the following error.
System.Data.SqlClient.SqlException: Invalid object name 'DB1.Customers'

I have tried removing the DB1. part from the select statement and specifying Database = DB1 in my connection string but that doesnt work either.

Any help provided would be greatly appreciated.

Thanks.

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Sep 17, 2007

hi,

i have to give connection string in .cs file
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i have to connect to local computer..please anyone provide me solution.
datbase is northwind...and i m connected it with windows authentication..
please any one provide me answer....

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Aug 19, 2006

Hi I am new at this.   
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the line of code thats causing this error is:
con = new SqlConnection("data source=(local)\NetSdk; initial catalog=Friends; user id=sa");
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Feb 3, 2007

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First machine's IP address is say 202.33.44.55 and other machine IP address is say 203.33.55.66. Now I want to use each others databases i.e. I want to set their database group.
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Feb 13, 2007

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{
//Create DataAdapter to fetch data from Prodcuts table
SqlDataAdapter myCommand = new SqlDataAdapter("select * from Products", myConnection);
//Create dataset and fill it with Product data
DataSet ds = new DataSet();
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Mar 10, 2007

Hi guys,
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Anyone tell me what the problem is.
 
 

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Aug 18, 2007

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2 Message="Cannot open database "Japanese" requested by the login. The login failed.
Login failed for user 'HOWSER\chobo'."
3 Source=".Net SqlClient Data Provider"
4 ErrorCode=-2146232060
5 Class=11
6 LineNumber=65536
7 Number=4060
8 Procedure=""
9 Server="localhost\SqlExpress"
10 State=1
11 StackTrace:
12 at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
13 at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
14 at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
15 at System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK)
16 at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject)
17 at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart)
18 at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance)
19 at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance)
20 at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection)
21 at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options)
22 at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject)
23 at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject)
24 at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
25 at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
26 at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
27 at System.Data.SqlClient.SqlConnection.Open()
28 at Practice.Page_Load(Object sender, EventArgs e) in h:WebsiteJapanesePractice.aspx.cs:line 28
29 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
30 at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
31 at System.Web.UI.Control.OnLoad(EventArgs e)
32 at System.Web.UI.Control.LoadRecursive()
33 at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
34 This is what I have as my connection stuffwebconfig 1 <connectionStrings>
2 <add name="Japanese" connectionString="Server=localhostSqlExpress;
3 Database=Japanese; Integrated Security=True"
4 providerName ="System.Data.SqlClient"/>
5 </connectionStrings>
6
7 In my file 1 SqlConnection conn;
2 SqlCommand comm;
3 SqlDataReader reader;
4
5 string connectionString = ConfigurationManager.ConnectionStrings["Japanese"].ConnectionString;
6 conn = new SqlConnection(connectionString);
7
8 comm = new SqlCommand("SELECT HiraganaCharacter,HiraganaImage FROM Hiragana", conn);
9 conn.Open();
10 reader = comm.ExecuteReader();
 Thanks    

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Sep 7, 2007

Hi,
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when I try to login the website I got this error
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I use the login control
+++
another error I get it when I request data from tables other than the member ship and roles tables,
the error is
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Oct 11, 2007

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Nov 20, 2007

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SqlCommand SqlCmd = null;String strConnection = null;
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//Ucase
strAction = (strAction);
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long lngCount;string strPart1 = "";
string strPart2 = "";
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{
//Build Column Name Part strPart1 = strPart1 + "`" + strData[lngIter, 0] + "`,";
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}
}
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}
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{
//Ensure is not empty if (strWhere[lngIter, 0] != "")
{
//Use default compare of equal but allow override string strCompare = "="; ;
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{
strCompare = strWhere[lngIter, 2];
}
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}
}
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}
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{
//Concatenate strSQL = strSQL + " WHERE " + strWhereOverride;
}
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}
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Nov 21, 2007

I get the following error:
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Dec 22, 2007

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command.ExecuteNonQuery();
connection.Dispose();
}
 ALTER PROCEDURE dbo.GE_sp_INSERT_USER
(@FirstName nvarchar(50),
@LastName nvarchar(50),@UserName nvarchar(50),
@Password nvarchar(50),@PhoneNumber nvarchar(50),
@EmailAddress nvarchar(50),@Address nvarchar(50),
@City nvarchar(50),@State nvarchar(50),@ZipCode nvarchar(50)
)
 
ASINSERT INTO USERS
(FirstName, LastName, UserName, Password, PhoneNumber, EmailAddress, Address, City, State, ZipCode)
VALUES
(@FirstName, @LastName, @UserName, @Password, @PhoneNumber, @EmailAddress, @Address, @City, @State, @ZipCode)
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#############
 
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The datasource I want to connect to is SqlDataSource1, and the table I want to search is “Reviewsâ€?. I want to search in the column “ProductIDâ€? and search for the ProductID from the URL query string above.
       
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##########################
 
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Regards
 
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