want to prevent asp.net membership firing if new user does not complete form correctly??

hi,

I am using a create user wizard that has been personlized to capture address and other data.

There is also a file upload control that accepts MP3

In web config I specified maximum of 20MB

if the user uploads large file they will be redirected to Error page with a warning.

I have set up this using Global Asax file and method as  below

    private const int MyMaxContentLength = 1000; //Wathever you want to accept as max file.
    protected void Application_BeginRequest(object sender, EventArgs e)
    {
        if (Request.HttpMethod == "POST"
           && Request.ContentLength > MyMaxContentLength)
        {
            Response.Redirect("~/errorFileTooBig.aspx");
        }
    }

The created user has an event as below.

If the user uploads a larger file and is redirected to error page ----  how can I be sure that asp.net membership is not activated

and new user is added to the system?

The reason is I want the user to be able to return to the form again and

use the same User Name and Email of first attempt.

aspx

       
         <asp:LinkButton ID="StepNextButton" class="btn btn-success" CausesValidation="True"  CommandName="MoveNext"  ValidationGroup="signup" runat="server"><i class="fa fa-check-circle"></i> Submit my profile >> </asp:LinkButton>

Created User Event

 protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e)
    {


        MembershipUser newUser = Membership.GetUser(CreateUserWizard1.UserName);
        Guid UserGUID = (Guid)newUser.ProviderUserKey;





        TextBox FirstName = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("FirstName");
        TextBox Surname = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Surname");
        TextBox Email1 = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Email");
        TextBox Mobile = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Mobile");
        DropDownList CountryCode = (DropDownList)CreateUserWizardStep1.ContentTemplateContainer.FindControl("CountryCode");
        TextBox Address = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Address");

        TextBox Address2 = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Address2");


        TextBox Town = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Town");
        TextBox City = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("City");
        TextBox Postcode = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Postcode");
        DropDownList CountryDDL = (DropDownList)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Country");
   

        InsertArtist.InsertParameters["FirstName"].DefaultValue =
 FirstName.Text.ToString();



        InsertArtist.InsertParameters["LastName"].DefaultValue =
 Surname.Text.ToString();



        InsertArtist.InsertParameters["Email"].DefaultValue =
Email1.Text.ToString();





        InsertArtist.InsertParameters["Mobile"].DefaultValue =
CountryCode.SelectedValue.ToString() + Mobile.Text.ToString();


        InsertArtist.InsertParameters["Bio"].DefaultValue = ArtistBio.Text.ToString();





        InsertArtist.InsertParameters["StageName"].DefaultValue =
StageName.Text.ToString();


        InsertArtist.InsertParameters["Website"].DefaultValue =
Website.Text.ToString();


        InsertArtist.InsertParameters.Add("ArtistId", UserGUID.ToString());


        InsertArtist.Insert();






        // First Audio File Upload






        FileUpload File1 = (FileUpload)CreateUserWizardStep1.ContentTemplateContainer.FindControl("Audio2");




        if (File1.HasFile)
        {
            string fileExt = System.IO.Path.GetExtension(File1.FileName);



            if (fileExt == ".mp3" )
            {



                const string PhotoDirectory = "~/Audio/";
                string brochurePath = PhotoDirectory + File1.FileName;
                string fileNameWithoutExtension =
                    System.IO.Path.GetFileNameWithoutExtension(File1.FileName);

                int iteration = 1;

                while (System.IO.File.Exists(Server.MapPath(brochurePath)))
                {
                    brochurePath = string.Concat(PhotoDirectory, fileNameWithoutExtension,
                        "-", iteration, ".mp3");
                    iteration++;
                }



                // Save the file to disk and set the value of the brochurePath parameter
                File1.SaveAs(Server.MapPath(brochurePath));
                Audio0.InsertParameters.Add("ArtistId", UserGUID.ToString());

                Audio0.InsertParameters.Add("Url", brochurePath.ToString());
                Audio0.InsertParameters.Add("Name", SongName2.Text.ToString());



                Audio0.Insert();



            }

        }







        {

            Response.Redirect("http://xxxxxxxxxxxxxcom/pending.aspx");

        }





    }