How do I...access radiobutton value grouped in repeater [asp.net, c#]

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ASP.NET

C#5.0

RadioButton

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How can i accessed check value of radio button used in repeater. [using asp.net and C#],
Data is populated from sql server database.

<asp:Repeater ID="rptProfession" runat="server" >
<itemtemplate>

<%# DataBinder.Eval(Container, "DataItem.DescE")%>
<%# DataBinder.Eval(Container, "DataItem.DescA")%>
<asp:RadioButton id="rdbUser" runat="server" OnClick="javascript:SelectSingleRadiobutton(this.id)" />


C# Code Behind Button:
public void Submit_Evaluation(Object s, EventArgs e)
{
foreach (RepeaterItem item in rptProfession.Items)
{
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
{

RadioButton rb = (RadioButton) item.FindControl("rdbUser");
if (rb.Checked)
{
pbadErrorMessage = "Good";
}
if (!rb.Checked)
{
pbadErrorMessage = "Bad";
}
}
}