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.

Is this using ASP.NET MVC or WebForms? Also, do you have any specific controls on the page that you would like the status to be shown in? — Tomas Aschan
– Tomas Aschan, Commented May 13, 2010 at 22:52
ASP.NET MVC, I have not put any controls in place for it as I am a little unsure what controls it could write to. Would <asp:Literal runat="server" ID="ErrorMessage"/> be appropriate ? or am i drifting in the wrong direction. — Yardstermister
– Yardstermister, Commented May 13, 2010 at 22:57
What class does that private method belong to - the controller? Could you post the code for the controller action that is calling it? — ten5peed
– ten5peed, Commented May 13, 2010 at 23:04
Ps. With ASP.NET MVC, using anything with runat="server" is drifting completely down the wrong direction. — ten5peed
– ten5peed, Commented May 13, 2010 at 23:09

TylerH · Accepted Answer · 2018-08-01 19:27:10Z

MVC

See for a good example...

ASP.NET MVC Html.ValidationSummary(true) 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 to the related validator in the code behind. The related ValidationSummary should display the error message.

Bala · Accepted Answer · 2010-05-14 05:04:54Z

0

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

answered May 14, 2010 at 5:04

Bala

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Comments

CarmineSantini · Accepted Answer · 2010-05-13 23:01:47Z

-1

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.

answered May 13, 2010 at 23:01

CarmineSantini

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