adding more rows and data

Question

hi guys

here is my problem

i know to make table from html

<table id="mytable"  style = ...  runatserver = true>

<tr>

<td> .... </td>

</tr>

</table>

but i really want to add more rows and data from css ... , and i dont know how to do that ..

because iam using c# to make a project  and i want to add more rows and data when the customer press (add) button

here (c# code)

mytable.style.add("???","???") ... i dont know what should i write here so i can add more rows and data ...

i hope you guys can help me

thank you