Select Some Checkboxes

Javascript

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    function AddRemoveSelected(obj, studId) {

            //debugger;

            if (obj.checked == true) {
                document.getElementById('<%=hdnSelected.ClientID%>').value = document.getElementById('<%=hdnSelected.ClientID%>').value + ',' + studId;
            }
            else {
                document.getElementById('<%=hdnSelected.ClientID%>').value = document.getElementById('<%=hdnSelected.ClientID%>').value.replace(studId, '');
            }

        }

-------------------------------------------ASPX---------------------------------------------
 <ItemTemplate>


                            <asp:CheckBox ID="selectchk" onclick='<%# "AddRemoveSelected(this," + Eval("StudID") + ");" %>'
                                runat="server" />

                        </ItemTemplate>




-------------------------------------------------------ASPX.CS---------------------------

protected void Page_Load(object sender, EventArgs e)
    {
        ////Get hidden filed values
        string strRawIDs = hdnSelected.Value;

        string[] strIDs = strRawIDs.Split(',');

        ///////////////////////////