MVC :: Radiobutton Set Selected Value From Database?

I would like to know how to connect radiobutton to the database. I use linq. To set the value from database to a text box is easy. I did like this.

<%= Html.TextBox("Headline", Model.Item.Headline,
new { size="35", maxlenght="50"
})%>

But I would like to know how to do for radiobuttonlist. This are my radiobuttons..

<%= Html.RadioButton("company_ad", 0,
true,
new { id =
"p_ad" })%>
<label
for="p_ad">Privatperson</label>
<%= Html.RadioButton("company_ad",
1, new { id =
"c_ad" })%>
<label
for="c_ad">F"retag</label>

How can I connect to the datbase like I did with the textbox above.