C# Directive to indicate 32-bit or 64-bit build

Question

Is there some sort of C# directive to use when using a development machine (32-bit or 64-bit) that says something to the effect of:

if (32-bit Vista)
    // set a         


        

Answer 1

You can use Predefined Macros to set the properties on compilation

    #if (_WIN64) 
  const bool IS_64 = true;
#else
  const bool IS_64 = false;
#endif