Here is a C# program to read in two integers and output their sum:
namespace first { using System; using System.Threading; public class SumProg { public static void Main() { Console.Write("Type in the first number: "); string tFirstString = Console.ReadLine(); int tFirst = int.Parse(tFirstString); Console.Write("Type in the second number: "); string tSecondString = Console.ReadLine(); int tSecond = int.Parse(tSecondString); int tSum = tFirst + tSecond; Console.WriteLine("The sum is " + tSum); Thread.Sleep(3000); // wait for 3 seconds } } }