gistfile1.cs

using System;

namespace cp765432
{
	class MainClass
	{
		public static void Main(string[] args)
		{
			Method1(null);
		}//5. But ends here

		static void Method1(BaseClass arg)
		{
			//1. Breakpoint on line below
			if (arg is Class1 ||//2. Step over on this works correctly and gets to next IF(notice only 3 checks)
				arg is Class2 ||
				arg is Class3)
				Console.WriteLine("3");
			if (arg is Class1 ||//3. Step over on this doesn't work correctly and gets out of this method(notice 4 checks)
			    arg is Class2 ||
			    arg is Class3 ||
			    arg is Class4)
				Console.WriteLine("4");
			Console.WriteLine("5");//4. Step over IF above should end here
		}

		class BaseClass
		{
		}

		class Class1 : BaseClass
		{
		}

		class Class2 : BaseClass
		{
		}

		class Class3 : BaseClass
		{
		}

		class Class4 : BaseClass
		{
		}
	}
}