Interesting Asp .net mvc example

Question

I was trying a basic asp .net mvc project configuration explained below;

Before first submit, the result is left one in photo which is expected, after submit textbox(@Html.TextBoxFor(model => model.Name)) and text(@Model.Name) shows different values as seen in right one in photo, unexpectedly; why is it so? They show different values although their model is unique.

enter image description here

Model:

 public class Personnel
{
    public string Name { get; set; }
}

View:

@model deneme.Models.Personnel

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>


@using (Html.BeginForm("Index", "Home"))
{
    @Html.TextBoxFor(model => model.Name)

    <br/>
    <br/>

    @Model.Name

    <br/>
    <br/>

    <input type="submit" value="submit" />
}

Controller:

public ActionResult Index(Personnel personnel)
{
     if (string.IsNullOrEmpty(personnel.Name))
     {
         personnel.Name = "Ahmet";
     }
     else
     {
         personnel.Name = personnel.Name + "server";
     }

     return View(personnel);
}

did you submit the form without filling the text box first time. Then it is working fine as per your code — Shyju, Jul 24 '12 at 20:45
What browser are you using? I speculate that the browser might be auto-filling the form field.... — Tuan, Jul 25 '12 at 07:50
I tried in multiple browsers, @Vedran solved the problem. ModelState.Clear() solves. — serefbilge, Jul 25 '12 at 09:33

Vedran · Accepted Answer · 2012-07-25T08:39:30.913

1

Edit: My previous answer didn't answer your question.

If you add ModelState.Clear() to the controller action, it will work as you want it to.

public ActionResult Index(Personnel personnel)
{
     if (string.IsNullOrEmpty(personnel.Name))
     {
         personnel.Name = "Ahmet";
     }
     else
     {
         personnel.Name = personnel.Name + "server";
     }

     ModelState.Clear();
     return View(personnel);
}

edited Jul 25 '12 at 08:39

answered Jul 25 '12 at 00:03

Vedran

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6
21

The real question is why text and textbox have different values after submit? Both is related to the same model. – serefbilge Jul 25 '12 at 07:00
@serefbilge, I misunderstood the problem, this should fix it. – Vedran Jul 25 '12 at 08:16
Yes it worked, what is the mechanism? Is there a viewstate like thing (I think it is modelstate) ? – serefbilge Jul 25 '12 at 09:17
Take a look at the answers to this question: http://stackoverflow.com/questions/1775170/asp-net-mvc-modelstate-clear – Vedran Jul 25 '12 at 09:36

Interesting Asp .net mvc example

1 Answers1