title: Invalid value for key 'user instance'
body: <p>i have a problem with this code where the GridView1.DataBind(); give the error Invalid value for key 'user instance'. where did i do wrong?</p>
  
  <pre><code>if (Byday.Checked == true)
      {
          // ConnectionString to NorthWind Database.
          string connectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\shafiq\\Desktop\\cuba\\App_Data\\radiation.mdf;Integrated Security=True;User Instance=Truee";
  
          // Create SQLDataSource.
          SqlDataSource sqlDataSource = new SqlDataSource();
          sqlDataSource.ID = "SqlDataSource123";
          this.Page.Controls.Add(sqlDataSource);
  
          // Bind ConnectionString to SQLDataSource.
          sqlDataSource.ConnectionString = connectionString;
          // Retrieve records with only 5 Columns from Employees table of NorthWind Database.
          sqlDataSource.SelectCommand = "SELECT [date], [data] FROM [loc1] WHERE (([data] &gt;= '2') AND ([date] &gt;= '" + txtStartDate.ToString() + "') AND ([date] &lt; '" + Label9.ToString() + "')) ORDER BY [data] DESC, [date]";
  
          // Bind SQLDataSource to GridView after retrieving the records.
          GridView1.DataSource = sqlDataSource;
          GridView1.DataBind();
      }
  </code></pre>