<asp:GridView ID="RolesView" CssClass="itemList" AutoGenerateColumns="false" runat="server"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:CheckBox ID="RoleSelectedCheckBox" runat="server" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Role"> <ItemTemplate> <asp:Label ID="RoleNameLabel" Text='<%# Eval("Name") %>' AssociatedControlID="RoleSelectedCheckBox" runat="server" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Description"> <ItemTemplate> <asp:Label ID="RoleDescription" Text='<%# Eval("Description") %>' AssociatedControlID="RoleSelectedCheckBox" runat="server" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> AssociatedControlID="RoleSelectedCheckBox" is highlighted red even though it is perfectly valid.