How to Select multiple items in ListBox?

<div>
    <asp:ListBox ID="ListBox1" runat="server">
        <asp:ListItem Value="One" />
        <asp:ListItem Value="Two" />
        <asp:ListItem Value="Three" />
        <asp:ListItem Value="Four" />
        <asp:ListItem Value="Five" />
    </asp:ListBox>
</div>

protected void Page_Load(object sender, EventArgs e)
{
    ListBox1.SelectionMode = ListSelectionMode.Multiple;
    for (int i = 0; i < ListBox1.Items.Count; i++)
    {
        if(i == 0 || i == 2 || i == 4)
        {
            ListBox1.Items[i].Selected = true;
        }
    }
}