Hi David,

I think you may try the method
Object.ReferenceEquals Method
Example
[C#, C++, JScript] The following code example uses ReferenceEquals to
determine if two objects are the same instance.

[C#]
using System;

class MyClass {

  static void Main() {
     object o = null;
     object p = null;
     object q = new Object();

     Console.WriteLine(Object.ReferenceEquals(o, p));
     p = q;
     Console.WriteLine(Object.ReferenceEquals(p, q));
     Console.WriteLine(Object.ReferenceEquals(o, p));
  }
}

/*

This code produces the following output.

True
True
False

*/

Best regards,

Peter Huang
Microsoft Online Partner Support