Even in a managed world like .Net sometimes you gotta know where you’re actually running in – 32-bit or 64-bit. But how do you figure out where you at?

Well, In an 64-bit OS all pointers are 8 bits wide, so just check for the size of your pointers!

if ( IntPtr.Size == 8 ) {
  // 64 bit machine
}} else if ( IntPtr.Size == 4 ) {
  // 32 bit machine
}}