How to Display Validation Error Messages on an ASP.NET MVC Page?

Question

I am pretty new to ASP.NET and C# I have spent the day learning the basics of the ASP.NET Membership provider I have built all my validator but are getting stuck at outputting my error message on the page.

private void LogCreateUserError(MembershipCreateStatus status, string username)
{
    string reasonText = status.ToString();

    switch (status)
    {
        case MembershipCreateStatus.DuplicateEmail:
        case MembershipCreateStatus.DuplicateProviderUserKey:
        case MembershipCreateStatus.DuplicateUserName:

            reasonText = "The user details you entered are already registered.";
            break;

        case MembershipCreateStatus.InvalidAnswer:
        case MembershipCreateStatus.InvalidEmail:
        case MembershipCreateStatus.InvalidProviderUserKey:
        case MembershipCreateStatus.InvalidQuestion:
        case MembershipCreateStatus.InvalidUserName:
        case MembershipCreateStatus.InvalidPassword:

            reasonText = string.Format("The {0} provided was invalid.", status.ToString().Substring(7));
            break;
        default:
            reasonText = "Due to an unknown problem, we were not able to register you at this time";
            break;

    }

   //CODE TO WRITE reasonText TO THE HTML PAGE ??

}

What is the best way to output the varible result onto the page as I have relied upon the built in ASP:Validators until now.

Answer 1

Just add an asp label control to the page and then set it's text property with the return vale.

Answer 2

MVC

See for a good example...

http://stackoverflow.com/questions/2818219/asp-net-mvc-html-validationsummarytrue-does-not-display-model-errors

Basically, you need to propagate the error message and also that fact that there is an error to your view from your controller. ModelStateDictionary.AddModelError() will take care of both of these tasks for you.

You can then use ValidationExtensions.ValidationSummary() to display.

Webforms

You don't have to use a validator for this. Most people don't. A simple styled DIV should work well.

eg.

<div id="errorMessageDiv" runat="server"></div>

Notice the runat parameter.

Now in your code-behind you can try

errorMessageDiv.innerHTML = "some error message";

If you really want to use a validator checkout...

http://weblogs.asp.net/ashicmahtab/archive/2008/12/12/putting-messages-into-a-validationsummary-control-from-code.aspx

Basically you set the ErrorMessage and isValid parameters the related validator in the code behind. The related ValidationSummary should display the error message.

Answer 3

If using WebForms you might use a Label control and set the '.Text' property of it with your result. Or a Panel control. Or a UserControl specifically for outputting error messages (this is what I do) that you can add to your MasterPage.

Answer 4

You can use validation summary or you can use a label control to display the error message