The switch statement

A switch statement executes the statements that are associated with the value of a given expression, or a default of statements if no match exists.
The example
using System;
class Test
{
    static void Main(string[] args) {
        switch (args.Length) {
            case 0:
                Console.WriteLine("No arguments were provided");
                break;
            case 1:
                Console.WriteLine("One arguments was provided");
                break;
            default:
                Console.WriteLine("{0} arguments were provided");
                break;
        }
    }
}
switches on the number of arguments provided.