Finding the Duplicate Numbers in ASP.NET

 I show you how to write a program that will determine which of the numbers in the given list is duplicate using Microsoft ASP.NET.

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Program Listing

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Duplicate

{

    public partial class _Default : System.Web.UI.Page

    {

               

    

        protected void Button1_Click1(object sender, EventArgs e)

        {

           Dictionary<int, string> num_bers = new Dictionary<int, string>() {  

            {1,"1"},  

            {2,"2"},  

            {3,"3"},  

            {4,"4"},  

            {5,"3"},  

            {6,"1"},  

            {7,"1"},

            {8,"1"},  

            {9,"4"},

            {10,"4"}  

        };

        Label1.Text = "List of Numbers..........";

        foreach (KeyValuePair<int, string> pair in num_bers)

        {

            Label1.Text += "<br />" + pair.Key + " ........ " + pair.Value;

        }

        //get dictionary duplicate values.

        var duplicatesValue = num_bers.GroupBy(x => x.Value).Where(x => x.Count() > 1);

        Label1.Text += "<br /><br />List of Numbers that has Duplicate Values..........<br />";  

        foreach(var item in duplicatesValue)

        {

            Label1.Text += item.Key + "<br />";

        }

        }

        

        }

       

    }