Bind check box in datalist and show the selected checked

 <asp:DataList ID="da"   runat="server" ShowHeader="False" ShowFooter="False"
                        CellPadding="0" RepeatColumns="1" RepeatDirection="Vertical" style="overflow:scroll !important;">
                       <ItemStyle Width="200" HorizontalAlign="Left"></ItemStyle>
                        <ItemTemplate>
                            <input type="checkbox" class="radio_botton" value='<%# DataBinder.Eval(Container.DataItem, "uid")%>'
                                name='chk' <%# search != null && search.chk.IndexOf("," + DataBinder.Eval(Container.DataItem, "uid").ToString() + ",") > -1 ? "checked" : ""%>><%# DataBinder.Eval(Container.DataItem, "Amen_Name")%>
                        </ItemTemplate>
                    </asp:DataList>