how to stop creatuserwizard control creating user when passwords are not equal
<asp:CreateUserWizardStep ID="cuwStep2" Title="Step 2/2" runat="server">
                <ContentTemplate>
                <p><strong>Step 2/2</strong>: Enter your account information</p>
                    <table class="registrationtable">
                        <tr>
                            <td>Email:</td>
                            <td><asp:TextBox ID="Username" runat="server"></asp:TextBox><asp:TextBox ID="Email" runat="server" Visible="false"></asp:TextBox></td>
                            <td><asp:RequiredFieldValidator ID="reqUserName" runat="server"
                            ToolTip="Username is a required field"
                            ErrorMessage="Email is a required field"
                            ControlToValidate="Username"
                            ValidationGroup="cwMember"
                            Text="*" />
                            <asp:RegularExpressionValidator ID="regEmail" ControlToValidate="UserName"
                            Text="*"
                            ValidationExpression="w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*"
                            Runat="server"
                            ValidationGroup="cwMember" /></td>
                        </tr>
                        <tr>
                            <td>Password:</td>
                            <td><asp:TextBox ID="Password" runat="server" TextMode="Password"></asp:TextBox></td>
                            <td><asp:RequiredFieldValidator
                            ID="reqPassword"
                            runat="server"
                            ControlToValidate="Password"
                            ValidationGroup="cwMember"
                            Text="*"
                            ErrorMessage="Password is a required field" /></td>
                        </tr>
                        <tr>
                            <td>Confirm Password:</td>
                            <td><asp:TextBox ID="txtConfirmPassword" runat="server" TextMode="Password"></asp:TextBox></td>
                            <td><asp:RequiredFieldValidator
                             ID="reqConfirmPassword"
                             runat="server"
                             Display="Dynamic"
                             ControlToValidate="txtConfirmPassword"
                             ValidationGroup="cwMember"
                             Text="Confirm password" />
                             <asp:CompareValidator ID="cmpPassword"
                             runat="server"
                             Display="Dynamic"
                             ControlToValidate="Password"
                             ControlToCompare="txtConfirmPassword"
                             Text="*"
                             ErrorMessage="Passwords are not equal" />
                            </td>
                        </tr>
                    </table>
                    <asp:PlaceHolder ID="phValidationSummary" runat="server"></asp:PlaceHolder>
                    <asp:ValidationSummary
                    ID="vsSummary"
                    runat="server"
                    ValidationGroup="cwMember"
                    DisplayMode="BulletList"
                    HeaderText="Correct the following:" />
                </ContentTemplate>
            </asp:CreateUserWizardStep>

protected void cwMember_CreateUserError(object sender, CreateUserErrorEventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        CreateUserWizard cuw = (CreateUserWizard)sender;
        switch (e.CreateUserError)
        {
            case MembershipCreateStatus.DuplicateEmail:
                sb.Append(cuw.DuplicateEmailErrorMessage.ToString());
                break;
            case MembershipCreateStatus.DuplicateUserName:
                sb.Append("this email address is already registered, please use another email address");
                break;
            case MembershipCreateStatus.InvalidEmail:
                sb.Append(cuw.InvalidEmailErrorMessage.ToString());
                break;
            case MembershipCreateStatus.InvalidPassword:
                sb.Append(cuw.InvalidPasswordErrorMessage.ToString());
                break;
            case MembershipCreateStatus.InvalidUserName:
                sb.Append("username is not valid");
                break;
            case MembershipCreateStatus.UserRejected:
                sb.Append("administrator said 'no way'");
                break;
            default:
                break;
        }
        CreateUserWizardStep cuwStep2 = cuw.FindControl("cuwStep2") as CreateUserWizardStep;
        PlaceHolder phValidationSummary = (PlaceHolder)cuwStep2.ContentTemplateContainer.FindControl("phValidationSummary");
        CustomValidator cvError = new CustomValidator();
        cvError.ValidationGroup = "cwMember";
        cvError.ErrorMessage = sb.ToString();
        cvError.IsValid = false;
        phValidationSummary.Controls.Add(cvError);

    }