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

Question

Can anyone please tell about how to apply group name to html (input) radio button controls so that i can select any one of the available radio buttons?

I have input radios in a table. Each row contains two radios as follows. I want to select one from each row. But i am able to select only one radio button amongst all radio buttons present on all rows.

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

What change i have to make to select one radio button on each row?

Thanks, ~kaps

Answer 1

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 

Answer 2

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>