Move items from one listbox to another listbox and vice versa in asp.net

Introduction: In this article I will explain how to move items from one listbox to other listbox and vice versa in asp.net

Explanation: I have added the two listboxes to webform. One listbox contain the country name I will move data from one listbox to other listbox.

Design Section:

<fieldset style="width:300px">

    <legend><strong>ListBox Example</strong></legend> 

    <table style="height: 168px; width: 279px">

    <tr><td>  <asp:ListBox ID="lstbcountry" runat="server" SelectionMode="Multiple"

            Height="102px" Width="99px">

        <asp:ListItem>India</asp:ListItem>

        <asp:ListItem>England</asp:ListItem>

        <asp:ListItem>Cuba</asp:ListItem>

        <asp:ListItem>Russia</asp:ListItem>

        <asp:ListItem>Singapore</asp:ListItem>

        </asp:ListBox></td>

    <td colspan="2">

        <asp:Button ID="Button1" runat="server" Text=">" onclick="Button1_Click" />     

        <br />

        <asp:Button ID="Button3" runat="server" Text=">>" onclick="Button3_Click" />

        <br />

        <asp:Button ID="Button2"

            runat="server" Text="<" onclick="Button2_Click" />

        <br />

        <asp:Button ID="Button4" runat="server" Text="<<" onclick="Button4_Click" />

        </td>

    <td><asp:ListBox ID="lstbcountry2" runat="server" SelectionMode="Multiple"

            Height="96px" Width="97px">       

        </asp:ListBox></td></tr>

    </table>

       </fieldset>

ASP.NET Code (C#): write the following code in code behind file.

 using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

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

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    int i = 0;

    protected void Button1_Click(object sender, EventArgs e)

    {

        try

        {

            lstbcountry2.Items.Add(lstbcountry.SelectedItem);

            i = lstbcountry.SelectedIndex;

            lstbcountry.Items.RemoveAt(i);

        }

        catch (Exception ex)

        {

        }

    }

    protected void Button2_Click(object sender, EventArgs e)

    {

        try

        {

            lstbcountry.Items.Add(lstbcountry2.SelectedItem);

            i = lstbcountry2.SelectedIndex;

            lstbcountry2.Items.RemoveAt(i);

        }

        catch (Exception ex)

        {

        }

    }

    protected void Button3_Click(object sender, EventArgs e)

    {

        try

        {

            for (i = 0; i <= lstbcountry.Items.Count - 1; i++)

            {

                lstbcountry2.Items.Add(lstbcountry.Items[i]);

            }

            lstbcountry.Items.Clear();

        }

        catch (Exception ex)

        {

        }

    }

    protected void Button4_Click(object sender, EventArgs e)

    {

        try

        {

            for (i = 0; i <= lstbcountry2.Items.Count - 1; i++)

            {

                lstbcountry.Items.Add(lstbcountry2.Items[i]);

            }

            lstbcountry2.Items.Clear();

        }

        catch (Exception ex)

        {

        }

    }

}

VB code:

Dim i As Integer = 0

    Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlesButton2.Click

        lstbcountry.Items.Add(lstbcity.SelectedItem)

        i = lstbcountry2.SelectedIndex

       lstbcountry2.Items.RemoveAt(i)

    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlesButton1.Click

       lstbcountry2.Items.Add(lstbcountry.SelectedItem)

        i = lstbcountry.SelectedIndex

        lstbcountry.Items.RemoveAt(i)

    End Sub

    Protected Sub Button3_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlesButton3.Click

        Try

            For i = 0 To lstbcountry.Items.Count - 1

               lstbcountry2.Items.Add(lstbcountry.Items(i))

            Next

            lstbcountry.Items.Clear()

        Catch ex As Exception

        End Try

    End Sub

    Protected Sub Button4_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlesButton4.Click

        Try

            For i = 0 To lstbcity.Items.Count - 1

                lstbcountry.Items.Add(lstbcity.Items(i))

            Next

           lstbcountry2.Items.Clear()

        Catch ex As Exception

        End Try

    End Sub