using System;
using System.Diagnostics;
namespace FunctionIgnoreStepThrough
{
    class Program
    {
        static void Main(string[] args)
        {
            string fn = FullName("Pavel", "Chooch");
            Console.WriteLine(fn);
        }
        [DebuggerStepThrough]
        static string FullName(string fn, string ln)
        {
            return string.Format("{0} {1}",fn, ln);
        }
    }
}
With this small change now your debugger will skip over the FullName function.