how to add modal popup extender in a table inside innerhtml

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ASP.NET

C#5.0

Hello,

I hope you can help me with this problem.
I have a div.innerhtml with a table inside it ,and I want to put a popup modal extender in it ..
is it possible!!

<h2>Current Tasks</h2>
<div id="tasks"  runat="server" >
</div> 

tasks.InnerHtml += "<tr> <td>  " + task_name + " </td>  <td> " + task_progress + " </td> <td> the trigger should be here </td> "; 

and if it's not, can you guide me to an alternative way to achieve this !!
to put in consideration that I'm a beginner in this language :(

thank you in advance..