附上页面代码

<asp:TextBox ID="txtAnswer"runat="server"style="width:180px"></asp:TextBox>
                     <span style ="color :Red">*</span>
                     <asp:RequiredFieldValidator 
                        ControlToValidate ="txtAnswer"
                        ID="RequiredFieldValidator4"
                        runat="server"
                        ErrorMessage="(此项必填)"
                        Display="None">
                    </asp:RequiredFieldValidator>
                    <asp:RegularExpressionValidator 
                            ControlToValidate="txtAnswer"
                            ID="RegularExpressionValidator8"
                            runat="server"
                            ErrorMessage="您的答案少于四个字符或者多于五十个字符"
                             ValidationExpression="^.{4,50}$"
                             Display="None">
                    </asp:RegularExpressionValidator>
                    </li>
                     <uc:InteractiveMessager ID ="interactiveMessager5"
                        ControlToMessage ="txtAnswer"
                        runat ="server"
                        Text="用于取回密码。请尽量设得复杂一些，以防被人用找回密码功能窃取您的帐号。长度在四到五十个字符之间。"
                         ValidatorOkMessage ="答案已经输入">
                     </uc:InteractiveMessager>