Mvc model id 0 on post

Question

I have an edit page for my model. When i post model back to my controller, Id property is 0. How can i maintain Id property on post?

I'm posting model to view, so Id property is set on get request. My code is below.

View:

@model xandra.Models.ProjectModel

@using(Html.BeginForm())
{ 
    @Html.HiddenFor(m => m.Id) 
    @Html.LabelFor(m => m.Name)
    @Html.TextBoxFor(m => m.Name)

    <br />

    @Html.LabelFor(m => m.Description)
    @Html.TextAreaFor(m => m.Description)

    <br />

    @Html.LabelFor(m => m.Website)
    @Html.TextBoxFor(m => m.Website)

    <br />

    @Html.LabelFor(m => m.Active)
    @Html.CheckBoxFor(m => m.Active)

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

Controller:

[Authorize]
[HttpGet]
[InitializeSimpleMembership]
public ActionResult EditProject(string id)
{
    using (var entity = new dixraContext())
    {
        var project = entity.Projects.FirstOrDefault(m => m.UrlName == id);


        return View(project);
    }
}

[Authorize]
[HttpPost]
[InitializeSimpleMembership]
public ActionResult EditProject(ProjectModel model)
{
    using (var entity = new dixraContext())
    {
        var project = entity.Projects.FirstOrDefault(m => m.Id == model.Id);

        project.Name = model.Name;
        project.Description = model.Description;
        project.Website = model.Website;
        project.Tags = model.Tags;
        project.Active = model.Active;

        entity.SaveChanges();

        return RedirectToAction("GetProject", project.UrlName);
    }
}

And my model

public class ProjectModel
{
    [Key]
    [Required]
    public long Id { get; set; }

    [Required(AllowEmptyStrings=false)]
    public string Name { get; set; }

    [Required(AllowEmptyStrings=false)]
    public string Description { get; set; }

    [Required]
    public DateTime CreatedDate { get; set; }

    [Required]
    public int Creator { get; set; }

    public string Website { get; set; }

    [Required]
    public int CategoryId { get; set; }

    public virtual List<TagModel> Tags { get; set; }

    public string UrlName { get; set; }

    public bool Active { get; set; }
}

Answer 1

I've seen this happen before, it could be a bug. I have been able to work around it by adding the properties I need to be included in the post by not using the specific's view template syntax.

Instead of this:

@Html.HiddenFor(m => m.Id)

Use this:

<input type="hidden" value="@Model.Id" name="Id"/> 

Answer 2

Had the same problem. Here is solution: In controller class in action function (handled posted data) add line:

ModelState.Remove("Id");

If you don't do it, any value assigned by you to the Id property in the Model will be replaced with the value from POST request. So your Id change in the Model has no effect without removing it from ModelState.