Populating ListBox with the selected Items from other LisBox.

<asp:ListBox ID="ListBox1" SelectionMode="Multiple" runat="server"> <asp:ListItem>1</asp:ListItem> <asp:ListItem>2</asp:ListItem> <asp:ListItem>3</asp:ListItem> </asp:ListBox> <asp:ListBox ID="ListBox2" SelectionMode="Multiple" runat="server"> </asp:ListBox> <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

protected void Button1_Click(object sender, EventArgs e) { foreach (ListItem item in ListBox1.Items) { if (item.Selected == true) { ListBox2.Items.Add(item); } } }