MVC - change model's value in view on post [closed]

Question

I have view which displays some data from model. I have submit button which onClick event should change model's value and I pass model's with different values but my values in TextBoxFor stay the same as they were on page load. How can I change them?

Answer 1

That's how HTML helpers work and it is by design. They will first look in the POSTed data and after that in the model. So for example if you have:

<% using (Html.BeginForm()) { %>     <%= Html.TextBoxFor(x => x.Name) %>     <input type="submit" value="OK" /> <% } %> 

which you are posting to the following action:

[HttpPost] public ActionResult Index(SomeModel model) {     model.Name = "some new name";     return View(model); } 

when the view is redisplayed the old value will be used. One possible workaround is to remove the value from the ModelState:

[HttpPost] public ActionResult Index(SomeModel model) {     ModelState.Remove("Name");     model.Name = "some new name";     return View(model); }