using System;

public class Program

{

    public static void Main()

    {

        string name = "";

        do

        {

            Console.WriteLine("\nPlease enter your name: ");

            name = Console.ReadLine();

            if (name == "")

            {

                Console.WriteLine("You did not enter a name. Please try again.");

            }

        }

        while (name == "");

        Console.WriteLine("\nWelcome {0}!", name);

    }

}