I am makeing an app which uses WTS API function.

I have done most of it, except a little part where I should marshal a
structure from pointer.

I have found some code in newsgroups, but it is in C# and I use VB .NET.
I've tried to convert it by my own, but it gives me some errors in IDE.

Please someone take a look:

 WTS_SESSION_INFO[] sessionInfo = new WTS_SESSION_INFO[count];

  for (int index = 0; index < count; index++)
      sessionInfo[index] = Marshal.PtrToStructure(buffer +
(sizeof(WTS_SESSION_INFO) * index), typeof(WTS_SESSION_INFO));

I get an error at  - sizeof(WTS_SESSION_INFO) - 'WTS_SESSION_INFO' is a type
and cannot be used as an expression.

Can someone help