Custom Number Fomatting
 

I am trying to use a custom number format, that in just Excel is easy to do,
but i am using C#, and trying to get the cells to display a number and then
some letters after the number. Just like this - 4 hrs. In Excel the
format looks like this -# "hrs" - I am trying to mimic this in a C# program
and it won't work. Does anyone know how to do this?