C#

Please select up to five:
<asp:Repeater runat="server" ID="rptCandidats" >
        <ItemTemplate>
             <div>
 <asp:checkbox id="chResponse" runat="server"  AutoPostBack="True" OnCheckedChanged="Check_Clicked"></asp:checkbox>
<%# Eval("ResText")%> <a href="<%#Eval("ResLink")%>" class="moreinfo">   More Info</a>
<asp:HiddenField ID="ResId" runat="server" Value ='<%#Eval("ResponId")%>' />                           </div>
</ItemTemplate>
</asp:Repeater>

protected void Check_Clicked(Object sender, EventArgs e)
       {
           int checkedCount = 0;
           foreach (RepeaterItem r in rptCandidats.Items)
           {
              CheckBox cb = (CheckBox)r.FindControl("chResponse");
               if (cb.Checked)
               {
                   checkedCount += (sender as CheckBox).Checked ? 1 : -1;
               }
           }
           if (checkedCount > 5)
           {
               System.Web.HttpContext.Current.Response.Write("<SCRIPT LANGUAGE="JavaScript">alert(\"Only Up to five candidates can be selected.\")</SCRIPT>");
           }

       }