Unique Radio Button Select and in Datalist Control

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C#

ASP.NET

I have radio button list in Datalist Control which display an selected Mobile from database. now i want to select only one Radio button and its works fine. but its only return true value when i select 1st radio button. when i select any other mobile its always return False..

This is my Aspx page code :

<td align="left">
                                <asp:RadioButton ID="optSkinIsSelect" runat="server" />
                                <strong><span><%#DataBinder.Eval(Container.DataItem, "Name")%></span></strong>
                            </td>

I check this condition in my .CS file like this :

foreach (DataListItem item in DataList1.Items)
{
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
                {
                    RadioButton optSkinIsSelect = (RadioButton)item.FindControl("optSkinIsSelect");

                    
                        if (optSkinIsSelect != null)
                        {
                            if (optSkinIsSelect.Checked)
                            {
                                Response.Write(optSkinIsSelect.Checked.ToString());
                            }
                            else
                            {

                            }
                        }
                }
            }

Help me to find which radio button is checked. i know the idea we can check it bu for loop but how can i do that i dont knw....

Thank You....