Implement authorization in Asp.Net application

Hi,

    I have an ASP.NET application which has Admin.aspx page. The Db contains user roles like Admin, Approver, publisher etc.

    I want to allow only Admin users to access  Admin.aspx page. I want to implement something like Membership provider/ Forms authorization to achieve this.

   And i have to implement this code in page_load method.

   Please provide solution for this.

 Thanks in advance