Impersonation using using.

Using.Impersonate.cs

class Program
{  
  static void Main()  
  {
    WindowsIdentity id = ...;    
    using (new Persona(id)) 
    {
      // Act as id.
    }  
  }
}

class Persona : IDisposable
{ 
  private readonly WindowsImpersonationContext _;  

  public Persona(WindowsIdentity id)
  {
    _ = id.Impersonate();
  }  

  public void Dispose() 
  { 
    _.Undo();
  }
}