#pragma warning disable 164 int t = 0; for (int i = 0; i < 10; i++) { t++; _:; } Console.Write(t);"_:;" is an empty statement in C# (well, actually it's a label without any code following it). You can set a breakpoint on this line. However, to avoid the warning that you have got an unused label, you also need the #pragma line at the top of the source code file.