Validates email address only once, Why???

I am having problem with this code and was hoping if someone code guide me to the right direction.
I have the following form which validates username as a valid email address. However, if the email address is not valid once, it will show in the bottom of the form that email address is not valid. But if I hit submit button and it will submit the form and wouldn't look for validation.
Please fine the code below.
Thanks in advance

<%@ Page Language="VB" AutoEventWireup="false" MasterPageFile="~/MasterPage.master" CodeFile="createuser.aspx.vb" Inherits="createlogin_Default" %>
 
<asp:Content ID="Content1" runat="server" 
    contentplaceholderid="ContentPlaceHolder1">
    
    <asp:CreateUserWizard ID="CreateUserWizard1" runat="server">
        <WizardSteps>
            <asp:CreateUserWizardStep runat="server">
                <ContentTemplate>
                    <table border="0">
                        <tr>
                            <td align="center" colspan="2">
                                Sign Up for Your New Account</td>
                        </tr>
                        <tr>
                            <td align="right">
                                <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">User 
                                Name:</asp:Label>
                            </td>
                            <td>
                                <asp:TextBox ID="UserName" runat="server"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" 
                                    ControlToValidate="UserName" ErrorMessage="Email is required." 
                                    ToolTip="Email is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator>
                                    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="UserName" ErrorMessage="Email address is not valid" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator><br />
                                     
                            </td>
                        </tr>
                        <tr>
                            <td align="right">
                                <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label>
                            </td>
                            <td>
                                <asp:TextBox ID="Password" runat="server" TextMode="Password"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" 
                                    ControlToValidate="Password" ErrorMessage="Password is required." 
                                    ToolTip="Password is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator>
                            </td>
                        </tr>
                        <tr>
                            <td align="right">
                                <asp:Label ID="ConfirmPasswordLabel" runat="server" 
                                    AssociatedControlID="ConfirmPassword">Confirm Password:</asp:Label>
                            </td>
                            <td>
                                <asp:TextBox ID="ConfirmPassword" runat="server" TextMode="Password"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="ConfirmPasswordRequired" runat="server" 
                                    ControlToValidate="ConfirmPassword" 
                                    ErrorMessage="Confirm Password is required." 
                                    ToolTip="Confirm Password is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator>
                            </td>
                        </tr>
                        <tr>
                            <td align="right">
                                <asp:Label ID="EmailLabel" runat="server" AssociatedControlID="Email">E-mail:</asp:Label>
                            </td>
                            <td>
                                <asp:TextBox ID="Email" runat="server"></asp:TextBox>
                                
                            </td>
                        </tr>
                        <tr>
                            <td align="right">
                                <asp:Label ID="QuestionLabel" runat="server" AssociatedControlID="Question">Security 
                                Question:</asp:Label>
                            </td>
                            <td>
                                <asp:TextBox ID="Question" runat="server"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="QuestionRequired" runat="server" 
                                    ControlToValidate="Question" ErrorMessage="Security question is required." 
                                    ToolTip="Security question is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator>
                            </td>
                        </tr>
                        <tr>
                            <td align="right">
                                <asp:Label ID="AnswerLabel" runat="server" AssociatedControlID="Answer">Security 
                                Answer:</asp:Label>
                            </td>
                            <td>
                                <asp:TextBox ID="Answer" runat="server"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="AnswerRequired" runat="server" 
                                    ControlToValidate="Answer" ErrorMessage="Security answer is required." 
                                    ToolTip="Security answer is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator>
                            </td>
                        </tr>
                        <tr>
                            <td align="center" colspan="2">
                                <asp:CompareValidator ID="PasswordCompare" runat="server" 
                                    ControlToCompare="Password" ControlToValidate="ConfirmPassword" 
                                    Display="Dynamic" 
                                    ErrorMessage="The Password and Confirmation Password must match." 
                                    ValidationGroup="CreateUserWizard1"></asp:CompareValidator>
                                <br />
                            </td>
                        </tr>
                        <tr>
                            <td align="center" colspan="2" style="color:Red;">
                                <asp:Literal ID="ErrorMessage" runat="server" EnableViewState="False"></asp:Literal>
                            </td>
                        </tr>
                    </table>
                </ContentTemplate>
            </asp:CreateUserWizardStep>
            <asp:CompleteWizardStep runat="server" />
        </WizardSteps>
    </asp:CreateUserWizard>
    
</asp:Content>

Select allOpen in new window