How can I access td Id in aspx.cs page of asp.net c#?

Question

I have used this code but it doesn't work.

HtmlGenericControl T1 = (HtmlGenericControl)Page.FindControl("T1");
T1.Visible = false;

Error Is:

Object reference not set to an instance of an object

Answer 1

add runat="server" and id to TD

<td runat="server" id="tdToSelect">

now you can set

tdToSelect.visible = false;

If this is inside update panel use UpdatePanel.FindControl() method