Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability.
using System; using System.Linq; using System.Collections.Generic; class LinqExercise { static void Main(string[] args) { int[] arr = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 4, 5, 2, 3, 10 }; Console.Write("The numbers in the array are : \n"); Console.Write("1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 4, 5, 2, 3, 10 \n"); var n = from x in arr group x by x into y select y; Console.WriteLine("\nThe number and the frequency are : \n"); foreach (var arrno in n) { Console.WriteLine("Number " + arrno.Key + " appears " + arrno.Count() + " times"); } Console.ReadLine(); } }