Manual Exception Throwing Without Object C# with Example

 	using System;

	namespace CSharpExceptionHandling
	{
		class MyClass
		{
			public static void PrintArg(string arg)
			{
				try
				{
					try
					{
						if (arg == null) 
						{ 
							ArgumentNullException myEx = new ArgumentNullException("arg");
							throw myEx;
						}
						Console.WriteLine(arg);
					}
					catch (ArgumentNullException e)
					{
						Console.WriteLine("Inner Catch: {0}", e.Message);
						throw;
					} 
				} 
				catch
				{
					Console.WriteLine("Outer Catch: Handling an Exception.");
				}
			}
		}
		
		class Program {
			static void Main() {
				string s = null;
				MyClass.PrintArg(s);
			}
		}
	}