I am geting error in ienumerable<selectlist>

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ASP.NET

MVC

MVC5

here is my error:-

An exception of type 'System.InvalidOperationException' occurred in System.Web.Mvc.dll but was not handled in user code

Additional information: The ViewData item that has the key 'City' is of type 'System.String[]' but must be of type 'IEnumerable<SelectListItem>'.

i have converted my city from string to

IEnumerable

But still not working

here is my allofcity model(from here i am getting my city):-

public class allcity
   {
       [Key]
       public int cid { get; set; }
       [Required]
       public string cities { get; set; }
   }

here is my Registerviewmodel:-

public string FirstName { get; set; }
[Required]
public string MiddleName { get; set; }
[Required]
public string LastName { get; set; }
[Required]
public string Gender { get; set; }
[Required]
[DataType(DataType.Date)]
public string DOB { get; set; }
[Required]
[RegularExpression("^[0-9]{12}$")]
public decimal Mobile { get; set; }
[Required]
public string Address { get; set; }
[Required]

public IEnumerable<string> City { get; set; }

if i convert this :-

public IEnumerable<string> City { get; set; }

to this:-

public IEnumerable<selectlist> City { get; set; }

then it will not going to save in database

here is my Account Controller

  private ApplicationDbContext db = new ApplicationDbContext();
        // GET: /Account/Register
        [AllowAnonymous]
        public ActionResult Register()
        {
            IEnumerable<SelectListItem> item = db.allofcity.Select(C => new SelectListItem
            {
                Value = C.cities,
                Text = C.cities

            });
            ViewBag.citi = item;
            return View();
        }

        //
        // POST: /Account/Register
        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Register([Bind(Exclude = "UserPhoto")]RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                // To convert the user uploaded Photo as Byte Array before save to DB
                byte[] imageData = null;
                if (Request.Files.Count > 0)
                {
                    HttpPostedFileBase poImgFile = Request.Files["UserPhoto"];

                    using (var binary = new BinaryReader(poImgFile.InputStream))
                    {
                        imageData = binary.ReadBytes(poImgFile.ContentLength);
                    }
                }


                var user = new ApplicationUser() { UserName = model.Email , ConfirmPassword=model.ConfirmPassword,
 FirstName = model.FirstName,
 MiddleName = model.MiddleName,
 LastName = model.LastName,
 Gender = model.Gender,
 DOB = model.DOB,
Mobile = model.Mobile,
 Address = model.Address,
City=model.City};
                //Here we pass the byte array to user context to store in db
                user.UserPhoto = imageData;
               
                user.Email = model.Email;
                user.ConfirmedEmail = false;
                var result = await UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    System.Net.Mail.MailMessage m = new System.Net.Mail.MailMessage(
                         new System.Net.Mail.MailAddress("myid", "Web Registration"),
                         new System.Net.Mail.MailAddress(user.Email));
                    m.Subject = "Email confirmation";
                    m.Body = string.Format("Dear {0}<BR/>Thank you for your registration, please click on the below link to complete your registration: <a href=\"{1}\" title=\"User Email Confirm\">{1}</a>", user.UserName, Url.Action("ConfirmEmail", "Account", new { Token = user.Id, Email = user.Email }, Request.Url.Scheme));
                    m.IsBodyHtml = true;
                    System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp-mail.outlook.com");
                    smtp.Credentials = new System.Net.NetworkCredential("my id", "mypassword");
                    smtp.Port = 587;
                    smtp.EnableSsl = true;
                    smtp.Send(m);
                    return RedirectToAction("Confirm", "Account", new { Email = user.Email });
                }
                else
                {
                    AddErrors(result);
                }
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }

and here is my view:-

<div class="form-group">
        @Html.LabelFor(m => m.City, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.DropDownListFor(Model=>Model.City, (IEnumerable<SelectListItem>)ViewBag.citi, "Select City", new { @class = "form-control" })
        </div>
    </div>

What I have tried:

i Have same thing in another solution without Email Address verification , and it saves the selected city from the data base to my registerviewmodel

but in this solution i am using email verification and getting this error

i have tried everything but still error comes