ValidationMessage asp.net mvc

Question

I have a question about ModelState.AddModelError method and about the ValidationMessage method.

I am new to ASP.NET MVC and I am a little confused.

I wrote this code:

public ActionResult update(FormCollection collection)
{
    int oos = 0;

    try
    {
        oos = int.Parse(collection[0]);
    }
    catch
    {         
    }

    data d = new data();

    TryUpdateModel(d , collection.ToValueProvider());

    if (ModelState.IsValid)
    { 
         return View("index",d);
    }
    else
    {      
        ModelState.AddModelError("Date", "Wronge Date");   
        d.Id = 50;
        return View("index",d);
    }
}

and this code in the view side

@{

    ViewBag.Title = "index";
}

<h2>index</h2>
@TempData["Hi"]

@Html.ValidationMessage("fullname") 

@using (Html.BeginForm()) 
{ 
    @Html.AntiForgeryToken() @Html.TextBox("id", 70) 
    @Html.TextBox("Date", "3/2/1991 12:00:00 ص")
    @Html.ValidationMessage("Date","Please insert the correct Date Format") 

    <input type="submit"> 
}

My questions are, why the message Please insert the correct Date Format appears directly when I rune the index while still I did not submit the form, why when I submit the form with error in the date format,the same message appear but not the message that I set to the Date Key in the update method which is Wronge Date.

maybe still I do not understand those two methods so I hope to find somebody to explain them to me.

explnation with example or reference would be appreciated

Have you even declared the model in your view (@model yourAssembly.data)? Why are you using FormCollection instead of posting your model? And use the strongly typed helpers - @Html.TextBoxFor(m -> m.Date) and @Html.ValidationMessageFor(m -> m.Date) — user3559349
– user3559349, Commented Apr 19, 2015 at 23:06
If you post the model that will more helpful for us to know what kind of Message or validation you have set to your Date key!! — Guruprasad J Rao
– Guruprasad J Rao, Commented Apr 20, 2015 at 5:19

Martin · Accepted Answer · 2015-04-19 15:34:27Z

2

Please look at http://www.asp.net/mvc/overview/getting-started/introduction/adding-validation

Because you have already entered a message in the View it will use that over your error that you are adding from the controller. As for your fullname you do not have a message set yet, only the placehoder for the field.

answered Apr 19, 2015 at 15:34

Martin

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