/// <summary>Reverts the user context to the Windows user represented by this object.</summary>
/// <exception cref="T:System.Security.SecurityException">An attempt is made to use this method for any purpose other than to revert identity to self. </exception>
public void Undo()
{
if (!WindowsImpersonationContext.RevertToSelf())
{
WindowsImpersonationContext.CloseToken(this._token);
throw new SecurityException("Couldn't switch back to original token.");
}
WindowsImpersonationContext.CloseToken(this._token);
this.undo = true;
GC.SuppressFinalize(this);
}
