.net 前臺驗證輸入是否一致

<asp:TextBox ID="txtIndividualEmail" runat="server" Width="224px" ></asp:TextBox>
 <asp:TextBox ID="TextBoxReconfirmEmail" runat="server" Width="224px"
                                         ></asp:TextBox><asp:CompareValidator ID="CompareValidator8" runat="server"
                                        ErrorMessage="Please input the same Email!" ControlToCompare="txtIndividualEmail"
                                        ControlToValidate="TextBoxReconfirmEmail" ValidationGroup="2" ></asp:CompareValidator>

<asp:Button ID="btnMyCurrentThought" runat="server" Text="提交 " OnClick="btnMyCurrentThought_Click" ValidationGroup="2" />