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Example of dual list box in ASP.NET

Posted on 2007-11-17
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Last Modified: 2013-12-26
Hello - can anybody point me to a good sample of how to program a dual list box in ASP.NET 2.0, using VB?

(two list boxes, side by side; user double-clicks an item from the left-hand list box (or single-click's it, and clicks a button), and it drops off the left-hand list box and appears on the right-hand list box)

Thanks

Mark
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Question by:mlagrange
2 Comments
 
LVL 16

Accepted Solution

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McExp earned 2000 total points
ID: 20305839
I have created a sample page which demonstrates the key principals you are looking for.
<%@ Page Language="VB" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<script runat="server">
 
    Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        If (ListBox1.SelectedIndex >= 0) Then
            ListBox2.ClearSelection()
            Dim tmpItem As ListItem = ListBox1.SelectedItem
            ListBox1.Items.Remove(tmpItem)
            ListBox2.Items.Add(tmpItem)
        End If
    End Sub
 
    
    Protected Sub LinkButton2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        If (ListBox2.SelectedIndex >= 0) Then
            ListBox1.ClearSelection()
            Dim tmpItem As ListItem = ListBox2.SelectedItem
            ListBox2.Items.Remove(tmpItem)
            ListBox1.Items.Add(tmpItem)
        End If
    End Sub
</script>
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
    <tr>
    <td><asp:ListBox ID="ListBox1" runat="server">
        <asp:ListItem>Item A</asp:ListItem>
        <asp:ListItem>Item B</asp:ListItem>
        <asp:ListItem>Item C</asp:ListItem>
    </asp:ListBox></td>
    <td>
        <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click" >></asp:LinkButton><br />
        <asp:LinkButton ID="LinkButton2" runat="server" OnClick="LinkButton2_Click" ><</asp:LinkButton>
    </td>
    <td><asp:ListBox ID="ListBox2" runat="server"></asp:ListBox></td>
    </tr>
    </table>
    </div>
    </form>
</body>
</html>

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by:mlagrange
ID: 20307958
Great - that's part of what I neeeded

I am going to accept this answer, and then ask a follow-up question; I would appreciate it if you would take a look at it.

Thanks

Mark

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