後臺控制前台元件需加上 id 和 runat="server"
<table>
<tr id="test1" runat="server">
<td>1-1</td>
<td>1-2</td>
<td>1-3</td>
<td>1-4</td>
</tr>
<tr id="test2" runat="server">
<td>2-1</td>
<td>2-2</td>
<td >2-3</td>
</tr>
<tr id="test3" runat="server">
<td>3-1</td>
<td>3-2</td>
<td>3-3</td>
</tr>
</table>
才可在後台呼叫，例如
test1.Style["display"] = "none";//不顯示
test2.Style["display"] = "block";//顯示
但在後台控制時，若是只要控制顯示test1及test2，而test3固定顯示
也需要加上test3的後台控制，否則表格顯示會怪怪的
protected void Button1_Click(object sender, EventArgs e)
{
test1.Style["display"] = "block";
test2.Style["display"] = "none";
test3.Style["display"] = "block";
}
protected void Button2_Click(object sender, EventArgs e)
{
test1.Style["display"] = "none";
test2.Style["display"] = "block";
test3.Style["display"] = "block";
}
