Letting Users Who Visit A Website Add Records To A Sql Server Database Using Visual Studio Web Developer Express Edition 2008

in visual studio web developer express edition 2008 i added a new item this was a sql server database which i called test2. I added a table called comments, and the fields name, email, comments, IPAddress, and Date and in my comments.aspx page i added a name textbox, a texbox for email, a textbox for comments and the submit button i double clicked on the submit button and added the following code

 Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click        Dim mydS As New SqlDataSource        mydS.ConnectionString = ConfigurationManager.ConnectionStrings("testConnectionString1").ToString         mydS.InsertCommandType = SqlDataSourceCommandType.Text         mydS.InsertCommand = "INSERT INTO comments(Name,Email,Comments,IPAddress,Date) VALUES (@Name,@Email,@Comments,@IPAddress,@Date)"         mydS.InsertParameters.Add("Name", TextBox1.Text)        mydS.InsertParameters.Add("Email", TextBox2.Text)        mydS.InsertParameters.Add("Comments", TextBox3.Text)        mydS.InsertParameters.Add("Date", Date.Now)        mydS.InsertParameters.Add("IPAddress", Request.Params("REMOTE_ADDR"))         Dim rowsaffected As Int16 = 0        Try            rowsaffected = mydS.Insert        Catch ex As Exception            Server.Transfer("errors.aspx")        Finally            mydS = Nothing        End Try        If rowsaffected <> 1 Then            Server.Transfer("errors.aspx")        Else            Server.Transfer("confirm.aspx")        End If    End Sub     Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged     End Sub but when i run it it gives me a problem with this line mydS.ConnectionString = ConfigurationManager.ConnectionStrings("testConnectionString2).ToString and says something abt unidentified object and I want to know how do i set the connection string or alternatively where?????? and my table does not update with the corresponding values i enter on the webpage. i also changed the authentication mode to forms instead of windows as i was advised but i'm still having a problem