Make certain lines of code unnecessary to debug

using System;
class MainClass 
{
      static void Main() 
      {
           Console.WriteLine("Normal line #1.");
           #line hidden
           Console.WriteLine("Hidden line.");
          #line default
          Console.WriteLine("Normal line #2.");
       }
}

The code between #line hidden and #line default cannot be broken. This method can be used to block some basic libraries that are confirmed to be bug-free.