Forms Authentication in ASP.NET 2.0

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The article is from Microsoft official MSDN site.

Forms Authentication Control Flow:

In ASP.NET 2.0, the validation of user credentials can be performed by the membership system. The Membership class provides the ValidateUser method for this purpose as shown here:

if (Membership.ValidateUser(userName.Text, password.Text))
{
    if (Request.QueryString["ReturnUrl"] != null)
    {
        FormsAuthentication.RedirectFromLoginPage(userName.Text, false);
    }
    else
    {
        FormsAuthentication.SetAuthCookie(userName.Text, false);
    }
}
else
{
    Response.Write("Invalid UserID and Password");
}

Full article please read MSDN