Question

i want to do some sql code run in my webservice in c#

the code is just

    [WebMethod]
    public void GetCustomers()
    {
        SqlConnection MyConn = new SqlConnection("Data Source=./SQLEXPRESS;AttachDbFilename=C:/Documents and Settings/Administrator/My Documents/Visual Studio 2008/Projects/WebService2/WebService2/App_Data/Database1.mdf;Integrated Security=True;User Instance=True");

        MyConn.Open();

        SqlCommand cmd = new SqlCommand();

        cmd.Connection = MyConn;

        cmd.CommandText = "delete from t1 where name='1'";   //just see ["+month
        // [mon+"] it's imp

        cmd.ExecuteNonQuery();
    }

now i get error like

System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server)

Answer 1

Correct Format:
Server=.\SQLExpress;AttachDbFilename=c:\mydbfile.mdf;Database=dbname; Trusted_Connection=Yes;
Try:

"Data Source=./SQLEXPRESS;AttachDbFilename=C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\WebService2\WebService2\App_Data\Database1.mdf; Database=YourDatabasName;Integrated Security=True;User Instance=True"
For more details see:
http://connectionstrings.com/