The while loop is one of the important looping construct, that is being widely used in C sharp programming language

it three things are important.

1. Initialization

2. Increment/Decrement

3. Termination

These are the important characteristics of any loop. Initialization represents the starting position from there your loop will be started. In the below example int i=0 refers to initialization of while loop. i++ refers to increment/decrement and finally while(i<10) refers to the termination of while loop.

using System;
namespace While
{
    class Program
    {
        static void Main(string[] args)
        {
            int num, Result, i;
            Console.WriteLine("Enter a number");
            num = Convert.ToInt32(Console.ReadLine());
            i = 1;           
            while (i <= 10)
            {
                Result = num * i;
                Console.WriteLine("{0} x {1} = {2}", num, i, Result);
                i++;  
            }
            Console.ReadLine();
        }
    }
}