Add offset to IntPtr

In .net 4 static Add() and Subtract() methods have been added.

IntPtr ptr = IntPtr.Add(oldPtr, 2);

http://msdn.microsoft.com/en-us/library/system.intptr.add.aspx

I suggest you to use ToInt64() and long to perform your computation. This way you will avoid problem on 64 bits version of the .NET framework.

IntPtr ptr = new IntPtr(oldptr.ToInt64() + 2);

This add a bit of overhead on 32 bits system, but it is safer.