how to decline login after specific time in asp.net

http://msdn.microsoft.com/en-us/library/ff647405.aspx[^]


1.Check that your ASP.NET application is not configured for impersonation by ensuring that impersonate is set to false on the <identity> element in the Web.config file.
...

<system.web>
 ...
 <authentication mode="Windows"/>
 <identity impersonate="false"/>
 ...
</system.web>
...

2.Obtain the authenticated user's Windows token.

IIdentity WinId= HttpContext.Current.User.Identity;
WindowsIdentity wi = (WindowsIdentity)WinId;

3.Use the authenticated user's Windows token to temporarily impersonate the original user and remove the impersonation token from the current thread when you are finished impersonating.

// Temporarily impersonate the original user.
WindowsImpersonationContext wic = wi.Impersonate();
try
{
  // here you will check time
  // Access resources while impersonating.
}
catch
{
  // Prevent exceptions propagating.
}
finally
{
  // Revert impersonation.
  wic.Undo();
}

This article will help you to solve this problem.