Question

If I am creating a relatively large structure, how can I calculate the bytes it occupies in memory?

We can do it manually, but if the struct is large enough then how do we do it? Is there some code chunk or application?

Answer 1

You can use either the sizeof operator or SizeOf function.
There are some differences between those options, see the reference links for more.

Anyway a good way to use that function is to have a generic method or extension method like these:

static class Test
{
  static void Main()
  {
    //This will return the memory usage size for type Int32:
    int size = SizeOf<Int32>();

    //This will return the memory usage size of the variable 'size':
    //Both lines are basically equal, the first one makes use of ex. methods
    size = size.GetSize();
    size = GetSize(size);
  }

  public static int SizeOf<T>()
  {
    return System.Runtime.InteropServices.Marshal.SizeOf(typeof(T));
  }

  public static int GetSize(this object obj)
  {
    return System.Runtime.InteropServices.Marshal.SizeOf(obj);
  }
}