My UI does not reflect changes to my Model [duplicate] - asp.net

Question

This question already has answers here:
MVC 3 - Html.EditorFor seems to cache old values after $.ajax call
(5 answers)
Closed 6 years ago.
I have a ASP MVC web app.
I have a partial form and it initally displays 'Hello Andy!'.
I press the submit button and I change this to 'Hello Andy Again!.
I pass the model back to the UI.
The label still shows the old value.
Why?
My markup:
#using (Ajax.BeginForm("SaveAlertPreferences", "Users", new AjaxOptions
{
UpdateTargetId = "partialform",
InsertionMode = InsertionMode.Replace,
HttpMethod = "POST",
{
<div>
#Html.AntiForgeryToken()
<div class="section group">
<div class="col span_3_of_12">
#Html.LabelFor(model => model.myStub)
</div>
<div class="col span_9_of_12">
#Html.TextBoxFor(model => model.myStub)
</div>
</div>
<div class="section group">
<div class="col span_3_of_12">
</div>
<div class="col span_4_of_12">
<input type="submit" value="Press me" />
</div>
<div class="col span_5_of_12">
</div>
</div>
</div>
}
My Model:
public class ChangeAlertPreferencesModel
{
public string myStub { get; set; }
}
My Controller:
[AcceptVerbs("HEAD", "GET")]
public PartialViewResult _ChangeAlertPreferences()
{
Response.CacheControl = "no-cache";
ChangeAlertPreferencesModel m = new ChangeAlertPreferencesModel();
m.myStub = "Hello Andy!";
return PartialView("_ChangeAlertPreferences", m);
}
[HttpPost]
public PartialViewResult SaveAlertPreferences(ChangeAlertPreferencesModel m)
{
Response.CacheControl = "no-cache";
if (ModelState.IsValid)
{
m.myStub = "Hello Andy Again!";
return PartialView("_ChangeAlertPreferences", m);
}
else
{
m.myStub = "I have errored!";
return PartialView("_ChangeAlertPreferences", m);
}
return null;
}

Answer 1

To complete my comment, your form statement looks odd,so you might wanna try this:
#using (Ajax.BeginForm("SaveAlertPreferences", "Users", new AjaxOptions
{
UpdateTargetId = "partialform",
InsertionMode = InsertionMode.Replace,
HttpMethod = "POST",
}))
{
#Html.AntiForgeryToken()
<div class="section group">
<div class="col span_3_of_12">
#Html.LabelFor(model => model.myStub)
</div>
<div class="col span_9_of_12">
#Html.TextBoxFor(model => model.myStub)
</div>
</div>
<div class="section group">
<div class="col span_3_of_12">
</div>
<div class="col span_4_of_12">
<input type="submit" value="Press me" />
</div>
<div class="col span_5_of_12">
</div>
</div>
}
To explain, in the first line, the using part declares the form and how it should behave, then you end(close) that declaration and open the block that should contain the body of the form.