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Error adding connection in Server Explorer: "Unable to add data connection. ExecuteScalar requires a

Posted By:      Posted Date: September 13, 2010    Points: 0   Category :ASP.Net
 
I'm using Visual Studio 2008, and my database is SQL Server 2000. I want to add a connection to the Server Explorer in VS. The Data source is Microsoft SQL Server (SqlClient). After entering in all my information and I click Test Connection, it is successful. But when I click OK, I get the error: Unable to add data connection. ExecuteScalar requires an open and available connection. The connection's current state is closed.What's going on here?


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after lots  of goes and back, I have the same problem but it is related to my Visual studio too. Because I can access to the same database  for new projects but when I use an existing project with a new default page I get the same error.
I am using visual studio 2005 connecting to MSSQL 2008 in server that has an instance of SQLServer express 2005 too
the code for boht new and existing project is bellow

I appricate any help

 

protected void Page_Load(object sender, EventArgs e)

{

 

SqlConnection cn =

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