Add a new property to Customer

I'm using version 3.8.
I have a new property ClientNumber in Customer.

What is done:

1. New column in dbo.Customer  ClientNumber.

2 In ..\Libraries\Nop.Core\Domain\Customers\Customer.cs:  
   public string ClientNumber { get; set; }

3. In ..>Nop.Admin\Models\Customers\CustomerModel.cs:

   [NopResourceDisplayName(“Admin.Customers.Customers.Fields.ClientNumber”)]
   [AllowHtml]
   public string ClientNumber { get; set; }  

4. In ..\Nop.Admin\Controllers\CustomerController.cs:

    [NonAction]
    protected CustomerModel PrepareCustomerModelForList(Customer customer)
    {
       return new CustomerModel()
        {
           ....
           ClientNumber=customer.ClientNumber;
           .. ..
        }
    }

5.  In   [HttpPost].... Create method :
    var customer = new Customer
                {
      ....                  
                    ClientNumber = model.ClientNumber,
                     ....
                };

6.  In   [HttpPost].... Edit method :

  customer.ClientNumber = model.ClientNumber;

7. In ActionResult Edit(int id):
   model.ClientNumber = customer.ClientNumber;

9.  In ..\Nop.Admin\Administration\Views\Customer\_CreateOrUpdate.cshtml:

    <div class="form-group">
                        <div class="col-md-3">
                            @Html.NopLabelFor(model => model.ClientNumber)
                        </div>
                        <div class="col-md-9">
                            @Html.NopEditorFor(model => model.ClientNumber)
                            
                        </div>
                 </div>


THE PROBLEM:
1. I get an empty column ClientNumber in view of all customers in admin mode.(The column in dbo.Customer has wel data.)

2. By trying to view customer details (..\Presentation\Nop.Web\Administration\Views\Customer\_CreateOrUpdate.cshtml ):

  Compiler Error Message: CS1061:
'Nop.Admin.Models.Customers.CustomerModel' does not contain a definition for 'ClientNumber'
and no extension method 'ClientNumber' accepting a first argument of type
'Nop.Admin.Models.Customers.CustomerModel' could be found
(are you missing a using directive or an assembly reference?)


(   Nop.Admin.Models.Customers.CustomerModel property  ClientNumber   -   see p.3  it was wel done! )

Hi,

It is not an answer for your question, but why you did not use "Custom customer attributes " from settings?

Regards,
Tomasz

Did you build Nop.Admin? Clean build the solution. And over check you process that you have done.