Extension Methods

Allows to add methods to a class without changing its source code or creating a new class without inheriting it
The extension methods need to be of static type and should belong in a static Class

The Class name by convention should be Datatype being extended followed by the Extensions word
The first Argument to the Extension Method has to be this <classToExtend> <name>

namespace ExtensionMethods
{
	public class Program
	{
		public static void Main(string[] args)
		{
			var post = "This is a very long post need to shorten it";
			var shortenedString = post.Shorten(5);
		}
	}
 
	public static class StringExtensions
	{
		public static string Shorten(this String inputString, int numOfWords)
		{
			var words = inputString.Split(" ");
			return string.Join(" ", words.Take(numOfWords)) + "...";
		}
	}
}