Trying To Use A Login Control Using Wisual Web Developer 2008?

I am trying to use a login control using wisual web developer 2008 with a SQL Express database. evrything is on my local machine at the moment.

This is the script I am using:

protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
{
Boolean blnresult;
blnresult = false;

Pass UserName and Password from login1 control to an authentication function which will check will check the user name and password from sql server.
// Then will retrun a true or false value into blnresult variable
blnresult = Authentication(Login1.UserName, Login1.Password);
// If blnresult has a true value then authenticate user
if (blnresult == true)

[Code]....