Can we add a TextBox within a RadioButtonList?

I have a RadioButtonList & besides the 1st ListItem I want to add a TextBox.

How can it be done? 

Don't think you can add a textbox inside a radiobuttonlist. So what you could do is position a textbox careful next to it to give the impression its part of it. Or create your own user control that has radiobuttons and a textbox with various server side properties to set the values of the radio buttons and textbox(es)

hope this helps