Guid should contain 32 digits with 4 dashes

Question

I had a website which contains a createuserwizard control. And upon creating an account, verification email along with its verify URL would be send to the user's email address.

However, when i have a test-run, upon clicking the URL in the email, this error appear:

Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).


Source Error: 

Line 17:         {
Line 18:             //store the user id
*Line 19:             Guid userId = new Guid(Request.QueryString["ID"]);*
Line 20: 
Error appeared on LINE 19. 

Another funny thing is, the verification URL in my test-run look weird :

http://localhost:4635/WebSite2/Verify.aspx?ID=System.Security.Principal.GenericPrincipal

Normally, the URL should like this(which is a whole lot of characters at the end of the URL:

http://localhost:2180/LoginPage/EmailConfirmation.aspx?ID=204696d6-0255-41a7-bb0f-4d7851bf7200

I was actually thinking that, it there a connection with the end of the URL with my problem of the error (Guid should contain 32 digits with 4 dashes)..

The code that generates the URL is as follows:

protected void CreateUserWizard1_SendingMail(object sender,MailMessageEventArgs e)
{ 
    string domainName = Request.Url.GetLeftPart(UriPartial.Authority) + Request.ApplicationPath; 
    string confirmationPage = "/Verify.aspx?ID=" + User.ToString(); 
    string url = domainName + confirmationPage; 
    e.Message.Body = e.Message.Body.Replace("<%VerificationUrl%>", url); 
}

Please give me suggestions and what I should do to solve this problems.

Thanks in advance.

UPDATE:

protected void CreateUserWizard1_SendingMail(object sender,MailMessageEventArgs e)
{
    MembershipUser userInfo = Membership.GetUser(CreateUserWizard1.UserName);
    Guid userInfoId = (Guid)userInfo.ProviderUserKey;

    string domainName = Request.Url.GetLeftPart(UriPartial.Authority) + Request.ApplicationPath;
    string confirmationPage = "/Verify.aspx?ID=" + userInfo.ToString();
    string url = domainName + confirmationPage;

    e.Message.Body = e.Message.Body.Replace("<%VerificationUrl%>", url);

}

Now my URL Link look like this :

http://localhost:4635/WebSite2/Verify.aspx?ID=username

But the error "Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" still remained

Answer 1

You've got a line that says:

Guid userInfoId = (Guid)userInfo.ProviderUserKey;

Surely this is what you should provide in the URL?

string confirmationPage = "/Verify.aspx?ID=" + userInfoId.ToString();

Answer 2

You're setting the ID as:

User.ToString()

This resolves to the string:

"System.Security.Principal.GenericPrincipal"

I don't see a GUID anywhere, so it's anyone's guess as to how you want to generate this.

Answer 3

You are not passing ID which is in your case GUID, You are trying to pass ID value=User.Tostring().