access to html radio button that created dynamically

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C#

ASP.NET

hi experts
i have a gridview that in every row of it i create several html radio button dynamically,how i can access to dynamic html radio button that i created them dinamically in click_button,when user clicked on submit click how i can understand wiche one them is checked?

protected void grdData_RowDataBound(object sender, GridViewRowEventArgs e)
    {

            var drvData = (DAL.CompetitionQuestion)e.Row.DataItem;

            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                var strLiteral = Template;
                var strOption = "";
                strLiteral = strLiteral.Replace("[Question]", drvData.QuestionBody);

                var query = BLL.Competitions.GetOptionByQuestionID(drvData.QuestionID);
                foreach (var item in query)
                {
                    strOption = strOption + string.Format("<input type=\"radio\" name=\"{0}\" value=\"{1}\"> {1}<br/>",item.QuestionID,item.OptionBody);
                }

                strLiteral = strLiteral.Replace("[Option]",strOption);
                e.Row.Cells[0].Text = strLiteral;
            }

    }

and its my sumit click

protected void btnVote_Click(object sender, EventArgs e)
    {
what i must write here for access to html radio button
}

thanks in advance