<!DOCTYPE html>
<html>
<body>
<form runat="server">
<asp:CheckBoxList id="lb1" runat="server" CellSpacing="15">
<asp:ListItem Value="Item 1" />
<asp:ListItem Value="Item 2" />
<asp:ListItem Value="Item 3" />
<asp:ListItem Value="Item 4" />
</asp:CheckBoxList>
</form>
</body>
</html>