this is my code for login but it has an error.it stuck when comes to Myconn.open().
the error is : The ConnectionString property has not been initialized.

this is the code :

Function DBAuthenticate(ByVal strUsername As String, ByVal strPassword As String) As Integer
Dim conMyData As SqlConnection
Dim cmdSelect As SqlCommand
Dim parmReturnValue As SqlParameter
Dim intResult As Integer


conMyData = New SqlConnection(ConfigurationManager.AppSettings("psmConnectionString"))
cmdSelect = New SqlCommand("sp_ValidateUser", conMyData)
cmdSelect.CommandType = CommandType.StoredProcedure
parmReturnValue = cmdSelect.Parameters.Add("RETURN_VALUE", SqlDbType.Int)
parmReturnValue.Direction = ParameterDirection.Input
cmdSelect.Parameters.Add("@noPekerja", SqlDbType.VarChar)
cmdSelect.Parameters.Add("@pWord", SqlDbType.VarChar)
conMyData.Open()
cmdSelect.ExecuteNonQuery()
intResult = cmdSelect.Parameters("RETURN_VALUE").Value
conMyData.Close()
If intResult < 0 Then
If intResult = -1 Then
lblMessage.Text = "Username Not Registered!"
Else
lblMessage.Text = "Invalid Password!"
End If
End If
End Function

pliz anybody can help me. :cry: