Get random integer within a specified range in CSharp

using System;/* ww  w  .  j  a v a2  s. c  o  m*/

public class Example
{
   public static void Main()
   {
      Random rnd = new Random();

      Console.WriteLine("\n20 random integers from -100 to 100:");
      for (int ctr = 1; ctr <= 20; ctr++) 
      {
         Console.Write("{0,6}", rnd.Next(-100, 101));
         if (ctr % 5 == 0) Console.WriteLine();
      }

      Console.WriteLine("\n20 random integers from 1000 to 10000:");      
      for (int ctr = 1; ctr <= 20; ctr++) 
      {
         Console.Write("{0,8}", rnd.Next(1000, 10001));
         if (ctr % 5 == 0) Console.WriteLine();
      }

      Console.WriteLine("\n20 random integers from 1 to 10:");
      for (int ctr = 1; ctr <= 20; ctr++) 
      {
         Console.Write("{0,6}", rnd.Next(1, 11));
         if (ctr % 5 == 0) Console.WriteLine();
      }
   }
}