Action<in T> or Func<,> delagations

I seem to be having trouble accessing the namespace for Func or Action… anyone know what namespace I’m supposed to be using?

The first answer helped me solve the same question. For anyone else that comes across this, adding “using System;” will allow Func<> and Action<> to be recognized in MonoDevelop (Or use System.Func<> and System.Action<>)

Its in C#, but I discovered its in the namespace System. Its just not recognized as a keyword by MonoDevelop