MVC5: Delete Identity User results in Null Entry for Parameter ID? - asp.net-mvc

Question

I have an administrator EDIT view created for USERS in my MVC5 application. Down in the bottom right I have a DELETE button that first asks the Admin logged in to confirm user deletion and then is supposed to execute the POST - Delete method in my UserManagement Controller. However when I confirm the deletion, I get an error of:
The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Threading.Tasks.Task`1[System.Web.Mvc.ActionResult] Delete(Int32)' in 'PROJECT.Areas.Admin.Controllers.UserManagementController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters
This is my delete button on the View:
<div class="col-md-2" style="width:180px; float: right; padding-top: 12px; padding-bottom: 7px; border-bottom: 1px solid #dddddd; ">
#using (Html.BeginForm("Delete", "UserManagement", new { id = Model.Id }, FormMethod.Post))
{
#Html.AntiForgeryToken()
<input type="submit" class="btn btn-danger btn-xs" value="Delete User" onclick="return confirm('Are you sure you want to delete this User?');" />
}
</div>
And this is the [HttpPost] of my Delete action:
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Delete(int id)
{
ApplicationUser applicationUser = db.Users.Find(id);
if (applicationUser == null)
{
ModelState.AddModelError("", "Failed to find User ID for deletion.");
}
else
{
IdentityResult result = await UserManager.DeleteAsync(applicationUser);
if (result.Succeeded)
{
await db.SaveChangesAsync();
return RedirectToAction("Index", "UserManagement");
}
else
{
ModelState.AddModelError("", "Failed to Delete User.");
var errors = string.Join(",", result.Errors);
ModelState.AddModelError("", errors);
}
}
return View(applicationUser);
}
Clearly somewhere I am failing to get the ID passed from the view to the Action, but I'm not quite sure how to resolve the issue. I'm still faily new to MVC development, let alone ASP.Net Identity. Any assistance appreciated!
EDIT:
I've tweaked my approach a little, but am still getting the same error. I have a Delete Confirmation View which loads the Delete() GET method. The View resembles the following:
#model PROJECT.Models.ApplicationUser
#{
ViewBag.Title = "Delete";
Layout = "~/Areas/Admin/Views/Shared/_LayoutAdmin.cshtml";
string cancelEditUrl = "/Admin/UserManagement/";
}
<h2>Delete</h2>
<h3>Are you sure you want to delete this User?</h3>
#using (Html.BeginForm("Delete", "UserManagement", new { id = Model.Id }, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
#Html.HiddenFor(model => model.Id)
#Html.HiddenFor(model => model.ForumUsername)
#Html.HiddenFor(model => model.ReceiveSystemEmails)
#Html.HiddenFor(model => model.RegisteredDate)
#Html.HiddenFor(model => model.LastVisitDate)
#Html.HiddenFor(model => model.MemberOrgId)
#Html.HiddenFor(model => model.ProfilePictureSrc)
<div class="container">
<div class="row">
<div class="editor-label">
#Html.LabelFor(model => model.Name)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.Name, new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.Name)
</div>
</div>
<div class="row">
<div class="editor-label">
#Html.LabelFor(model => model.Position)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.Position, new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.Position)
</div>
</div>
.....
<div class="row">
<div class="col-md-1" style="padding-left: 0px">
<input type="submit" value="Save" class="btn btn-primary" />
</div>
<div class="col-md-9" style="padding-left: 0px">
Cancel
</div>
</div>
}
My Controller Actions for Delete():
//GET: Admin/UserManagement/Delete/5
public async Task<ActionResult> Delete(string id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
ApplicationUser applicationUser = await UserManager.FindByIdAsync(id);
if (applicationUser == null)
{
return HttpNotFound();
}
return View(applicationUser);
}
// POST: Admin/UserManagement/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Delete(int id)
{
ApplicationUser applicationUser = db.Users.Find(id);
if (applicationUser == null)
{
ModelState.AddModelError("", "Failed to find User ID for deletion.");
}
else
{
IdentityResult result = await UserManager.DeleteAsync(applicationUser);
if (result.Succeeded)
{
await db.SaveChangesAsync();
return RedirectToAction("Index", "UserManagement");
}
else
{
ModelState.AddModelError("", "Failed to Delete User.");
var errors = string.Join(",", result.Errors);
ModelState.AddModelError("", errors);
}
}
return View(applicationUser);
}
ERROR:
The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Threading.Tasks.Task`1[System.Web.Mvc.ActionResult] Delete(Int32)' in 'PRISMdev.Areas.Admin.Controllers.UserManagementController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters
I'm not quite sure why my Model ID is coming in as NULL still to the Delete() POST action.