<!DOCTYPE html>
<html>
<body>
<form runat="server">
<asp:Table id="table1" runat="server" Width="50%" GridLines="Both" >
<asp:TableRow>
<asp:TableCell ColumnSpan="2">
ColumnSpan Example
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>
Hello
</asp:TableCell>
<asp:TableCell>
World!
</asp:TableCell>
</asp:TableRow>
</asp:Table>
</form>
</body>
</html>