How to apply groupname to HTML radio buttons in asp.net?

As far as I know, radiobuttons in HTML do not have group names. Their HTML "name" attribute is the group name.

It is important to verify that each radiobutton has a unique "value" attribute. Otherwise there is no way to tell which of the duplicate values was selected:

<input name="radiobutton" type="radio" value="radiobutton1" />Option1 
<input name="radiobutton" type="radio" value="radiobutton2" />Option2 

This example lets you choose only one radio button per table row. You have to give all radio buttons the same Name= to create a mutually exclusive group of them.

<form>

<table>
<tr><td>
    <!-- Can choose only one of these two. -->
    <input name="group1" type="radio" value="1a" />Option1 
    <input name="group1" type="radio" value="1b" />Option2 
</td></tr>
<tr><td>
    <!-- Can choose only one of these two. -->
    <input name="group2" type="radio" value="2a" />Option1 
    <input name="group2" type="radio" value="2b" />Option2 
</td></tr>
</table>

</form>