Active Directory: Windows authentication and AD roles - use of in ASP .Net

I've never done this  before.  I have to use roles that are set up in AD and then check them against the functionality of the ASP .Net web application.  Meaning I have to see which role the user is under then allow them access to certain pages/functionality accordingly.  Any help and direction is greatly appreciated!

I have no code in place for roles checking, etc.  The asp .net application has gridview/details view and roles are just limited to whether they can edit certain fields in the gridview.
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newbiealAuthor Commented:
Thanks, but it does not demonstrate use and access of active directory roles
newbiealAuthor Commented:
This is what I've come up with so far:

I've this under the page_load event:

If (Roles.IsUserInRole("domain\role_name")) Then
            Response.Write("you have no access permission.")
        End If

The page loads and the above statement is displayed.

Below is my web.config snippet.
<authentication mode="Windows" />
        <deny users="?" />  <!--Deny anonymous users -->
        <allow roles="domain\role_name" />

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