Manually selecting web page radio button

i want to programatically select a radio button in code. The radio button lives on an internal webpage.

I am trying so far like this,

HtmlElement rButton = b.Document.GetElementById("nameOfButton) 

whi开发者_StackOverflow社区ch i assume gets me a handle on the radio button, but i cant find a .selected = true or something similar. I need to do this because on the page, when this button is selected more values appear on the page which i then need to fill out.

edit: i think i have managed to do this using

rButton.invokemMemeber("click") - however i think i am still going down a cul de sac with this one.

i would like to add, i think that the page is using postback. if i click the radio button, a set of new options on the page appears, its one of these dynamically created text boxes i need a handle on. is this going to be impossible to get?

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You could do,

 var rButton = b.Document.GetElementById("nameOfButton"); 
    if(rButton != null)
         rButton.checked=true;

Hope this help.

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This is what worked for me:

if (doc.GetElementById("nameOfButton") != null)
            doc.GetElementById("nameOfButton").SetAttribute("checked", "true");

Good luck!