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<%@ Page language="c#" autoeventwireup="false"%>

<html>
<head>

<script language="c#" runat="server" ID=Script1>

private void UpdateButton_Click(Object sender, EventArgs e)
{
    GroupList.SelectedIndex = UserList.SelectedIndex;
}
</script>

</head>
<body>

    <form runat="server">
    <h3>Using ListBox</h3>
    <TABLE WIDTH="300" BORDER="0" CELLSPACING="1" CELLPADDING="1">
        <TR>
            <TD NOWRAP>Users:</TD>
            <TD NOWRAP></TD>
            <TD NOWRAP></TD>
        </TR>
        <TR>
            <TD NOWRAP>        
                <asp:ListBox id="UserList" runat="server" Rows="4">
                    <asp:ListItem>Paula</asp:ListItem>
                    <asp:ListItem>Chris</asp:ListItem>
                    <asp:ListItem selected="True">Eric</asp:ListItem>
                    <asp:ListItem>Wynn</asp:ListItem>
                </asp:ListBox>
            </TD>
            <TD NOWRAP>
            <asp:button text="Update ->" runat="server" ID="UpdateButton" onclick="UpdateButton_Click"/>
            </TD>
            <TD NOWRAP>        
                <asp:ListBox id="GroupList" runat="server" Rows="4">
                    <asp:ListItem>Paula</asp:ListItem>
                    <asp:ListItem>Chris</asp:ListItem>
                    <asp:ListItem>Eric</asp:ListItem>
                    <asp:ListItem>Wynn</asp:ListItem>
                </asp:ListBox>
            </TD>
        </TR>
    </TABLE>

    </form>

</body>
</html>