int starvalue = 3;

ContentPlaceHolder ch = (ContentPlaceHolder)Master.FindControl("middlecontent");

RadioButton radio = new RadioButton();

for (int i = 1; i <= 5;i++ )

{

radio = (RadioButton)ch.FindControl("rblStar" + i);

if (radio.Checked == true)

{

starvalue = i;

break;

}

}

MessageBox.Show(starvalue.ToString());