验证控件－ValidationSummary

    <div>
        用户名：<asp:TextBox ID="userName" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="userNameValid" runat="server"
            ControlToValidate="userName" ErrorMessage="必须输入用户名">*</asp:RequiredFieldValidator>
    </div>
   
    <div>
        密　码：<asp:TextBox ID="passwd" runat="server" TextMode="password"></asp:TextBox>
        <asp:RequiredFieldValidator ID="passwdValid" runat="server"
            ControlToValidate="passwd" ErrorMessage="必须输入密码">*</asp:RequiredFieldValidator>
    </div>
   
    <div>
        确认密码：<asp:TextBox ID="rePasswd" runat="server" TextMode="password"></asp:TextBox>
        <asp:RequiredFieldValidator ID="rePasswdValid" runat="server"
            ControlToValidate="rePasswd" ErrorMessage="必须输入确认密码">*</asp:RequiredFieldValidator>
        <asp:CompareValidator ID="rePasswdValid2" runat="server"
            ControlToValidate="rePasswd" ControlToCompare="passwd"
            Type="String" Operator="equal" ErrorMessage="两次密码必须一致">两次密码必须一致</asp:CompareValidator>
    </div>
   
    <div>
        <asp:ValidationSummary ID="regValidationSummary" runat="server"
            HeaderText="输入错误" DisplayMode="BulletList" />
    </div>
   
    <div>
        <asp:Button ID="btn" runat="server" Text="注册" />
    </div>