Can anyone tell me how to get the memory address of a variable in Visual Basic.NET?

I know you are supposed to just pass things around "ByRef" but I am using C functions as well which take pointers so i need specific memory addresses so that I can be sure I am passing things in right.

Can someone tell me how to find the address of a variable? This would be equivalent to the & operator in C. i.e. &x means address of x.

Thanks in advance!