Pinpoint Impersonate

In common web developing, I use impersonation to identify against some services, and some other applications like SQL server with my windows credentials.

The usual way is to add to the web.config this line: <identity impersonate="true"/>

This is best practice for most cases in web developing, but the problem here is, it will effect on all identification procedures we have in the application.

Pinpoint Impersonation

Suppose I don't want it to effect all my identification procedures, and I want to impersonate just for the specific procedure in my code and then undo the impersonation action, here is a nice way for pinpoint impersonation:

public static void Impersonate()
{
    IPrincipal principal = HttpContext.Current.User; 
    WindowsIdentity identity = (WindowsIdentity)principal.Identity; 
    identity.Impersonate(); 
    string userName = identity.Name;
}

public static void UndoImpersonate()
{
    IPrincipal principal = HttpContext.Current.User;
    WindowsIdentity identity = (WindowsIdentity)principal.Identity;
    identity.Impersonate().Undo();
    string userName = identity.Name;
}