Assembly: System.Web (in system.web.dll)
The name of the user to be validated.
The password for the specified user.
Return Valuetrue if the supplied user name and password are valid; otherwise, false.
ValidateUser provides an easy way to verify a user name and password from the data source. Note that, if the username parameter is empty or a null reference (Nothing in Visual Basic), an HttpException is thrown.
The following code example shows the login page for an ASP.NET application configured to use forms authentication and the Membership class. If the supplied user credentials are invalid, a message is displayed to the user. Otherwise, the user is redirected to the originally requested URL by the RedirectFromLoginPage method.
This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio).