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

Introduction: In this article today I will explain how we can move items from one listbox to another listbox and vice versa in asp.net
Description:
I have added the two listboxes to webform. One listbox contain the country name and second one city name.  In this example I have move single item from country listbox to city listbox and vice versa. Also move all items to between each other.
Design the page as Html Markup shown below:
<fieldset>
    <legend>ListBox Example</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="lstbcity" runat="server" SelectionMode="Multiple"
            Height="96px" Width="97px">
        <asp:ListItem>Delhi</asp:ListItem>
        <asp:ListItem>London</asp:ListItem>
        <asp:ListItem>Tokyo</asp:ListItem>
        <asp:ListItem>Boston</asp:ListItem>
        <asp:ListItem>Moscow</asp:ListItem>
        </asp:ListBox></td></tr>
    </table>
       </fieldset>


C# code:

int i = 0;

protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            lstbcity.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(lstbcity.SelectedItem);
            i = lstbcity.SelectedIndex;
            lstbcity.Items.RemoveAt(i);
        }
        catch (Exception ex)
        {
        }
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        try
        {
            for (i = 0; i <= lstbcountry.Items.Count - 1; i++)
            {
                lstbcity.Items.Add(lstbcountry.Items[i]);
            }
            lstbcountry.Items.Clear();
        }
        catch (Exception ex)
        {
        }       
    }
    protected void Button4_Click(object sender, EventArgs e)
    {
        try
        {
            for (i = 0; i <= lstbcity.Items.Count - 1; i++)
            {
                lstbcountry.Items.Add(lstbcity.Items[i]);
            }
            lstbcity.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) Handles Button2.Click
        lstbcountry.Items.Add(lstbcity.SelectedItem)
        i = lstbcity.SelectedIndex
        lstbcity.Items.RemoveAt(i)
    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        lstbcity.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) Handles Button3.Click
        Try
            For i = 0 To lstbcountry.Items.Count - 1
                lstbcity.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) Handles Button4.Click
        Try
            For i = 0 To lstbcity.Items.Count - 1
                lstbcountry.Items.Add(lstbcity.Items(i))
            Next
            lstbcity.Items.Clear()
        Catch ex As Exception
        End Try
    End Sub

Build and run the project.

Output:


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