user authentication

[Allah Kaa Bandaa]

Hi all, I have an asp.net web applicataion using C# as code behind. Currently it uses the active directory to authenticate the users. Now i want to chane this..... I want that the application now uses the adminstrator group or some other group on the local server on which application is installed. How can i do it... can some body help me by provide piece of code or by giving link or some url .... I need urgent help.........