public static void Main()
Console.WriteLine("Convert whatever number to 3-digit , e.g. {0} with ",number);
Console.WriteLine("============================ ");
Console.WriteLine( "{0,-20} formatting:\t{1:D3}","D3",number);
Console.WriteLine("{0,-20} formatting:\t{1:000}","000",number);
Console.WriteLine("{0,-20} formatting:\t{1:000} // 3-digit as Expected","000 with % 1000", number%1000);
Console.WriteLine("{0,-20} formatting:\t{1:D3} // 3-digit as Expected","D3 with % 1000", number%1000);