The edit button is deleting from the database instead of saving to it MVC - asp.net-mvc

Question

I have posted the relevant code to this issue below. My problem is, let's say, the database is displaying NA, I want to edit it and put in 1.1, or some number. Instead of updating and saving this new number, it deletes NA and does not update or save anything, so I know it is doing something, but I'm not sure where I have gone wrong. If I change the type in the model to int or object, it gives an error for conversion to string. Can someone help please? Thank you!
Controller:
public ActionResult Edit ()
{
return View ();
}
[HttpPost]
public ActionResult Edit(MyIssue issues)
{
var model = new Test.Models.Tables();
if (ModelState.IsValid)
{
db.Entry(issues).State = EntityState.Modified;
issues.Number = model.Number;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(issues);
}
Model:
namespace Test.Models
{
public class Tables: DbContext
{
public string Number { get; set; }
}
}
View:
<td>
#if (issue.Number != null)
{
#Html.HiddenFor(modelItem => issue.Number)
#Html.DisplayFor(modelItem => issue.Number)
<text>|</text>
<h5 id="editclass">
#Html.ActionLink("Edit", "Page1", new { id = issue.Number })
</h5>
using (Html.BeginForm())
{
#Html.ValidationSummary(true) {
<fieldset>
#Html.HiddenFor(modelItem => issue.Number)
<div class="editor-field">
#Html.EditorFor(modelItem => issue.Number)
#Html.ValidationMessageFor(modelItem => issue.Number)
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
}
}
}
</td>

Answer 1

From your code, I assume that the code you shown is inside a loop where issue is the loop iterator variable. So razor will generate an input field with name "issue.Number". When the form is submitted, model binder cannot bind this form value to the Number property of your MyIssue object ! So it gets the default null value and your code is assigning the null value as the Number property and saving it.
You should generate an input field with name="Number". You may use the Html.TextBox helper method to do so.
#foreach (var issue in SomeCollection)
{
<tr>
<td>
#using (Html.BeginForm())
{
<!-- Other fields also goes here -->
#Html.TextBox("Number",issue.Number)
<input type="submit" />
}
</td>
</tr>
}