How can I access td Id in aspx.cs page of asp.net c#?
<p>I have used this code but it doesn't work.</p>

<pre><code>HtmlGenericControl T1 = (HtmlGenericControl)Page.FindControl("T1");
T1.Visible = false;
</code></pre>

<p>Error Is:</p>

<pre><code>Object reference not set to an instance of an object
</code></pre>
