How To Remove Duplicate Values From ListBox Without Using DataBase in Asp.net C#



          Remove Duplicate Values  From ListBox 


Remove  Duplicate Values two ListBoxes  Using Without  Database Connection in Asp.net C#

Foreach  & if Conditions  Using  Remove Duplicate Values.





DEMO





Html Coding



<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body style="height243px">
    <form id="form1" runat="server">
    <div>
   
    <asp:ListBox ID="ListBox1" runat="server" Height="104px"
 OnSelectedIndexChanged="ListBox1_SelectedIndexChanged" Width="95px">

            <asp:ListItem>AAA</asp:ListItem>
            <asp:ListItem>BBB</asp:ListItem>
            <asp:ListItem>CCC</asp:ListItem>
            <asp:ListItem>DDD</asp:ListItem>

        </asp:ListBox>


  <asp:ListBox ID="ListBox2" runat="server" Height="142px" Width="110px" >

            <asp:ListItem>AAA</asp:ListItem>
            <asp:ListItem>BBB</asp:ListItem>
            <asp:ListItem>CCC</asp:ListItem>
            <asp:ListItem>DDD</asp:ListItem>
            <asp:ListItem>EEE</asp:ListItem>
            <asp:ListItem>FFF</asp:ListItem>
            <asp:ListItem>GGG</asp:ListItem>
            <asp:ListItem>EEE</asp:ListItem>

        </asp:ListBox>   

     
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click"
 Text="Remove Duplicates" />
   
    </div>
    </form>
</body>


</html>


C# Coding



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {



        foreach (ListItem LISTBOXES in ListBox1.Items)
        {

            if (ListBox2.Items.Contains(LISTBOXES) == true)
            {

                ListBox2.Items.Remove(LISTBOXES);

            }

        }



    }



}




First  Add - New - Webform 








Next - Add the  Two ListBoxes From Toolbox







Select - ListBox1 - Right Click - Select Edit Items 









Next - Add  ListItems (Required)









Next - Add - Text Name (Reqiured) - OK








Next - Select Listbox2 - Right Click - Select Edit Items - Add - ListItems -  Enter the Text Name(Required) - OK.








Show The ListBoxes  Text Values 










Next - Add the Button - Change Text  Name - Double Click Button







Write The Coding Using Foreach  & Remove Duplicate  Values From ListBox2







        


Next - Run (F5) - Show the List Box Vaues 









Next -  Click The Button  - Duplicate Values  Remove & Show Below 








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