Hi everybody,

When I try to save data using jquery ui dialog I am getting the following error (few lines from the stack in FireBug console HTML):

[MissingMethodException: No parameterless constructor defined for this object.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +113
   System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +232
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +83
   System.Activator.CreateInstance(Type type) +6
   System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) +183
   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +564
   System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +416
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +317
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +117
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__1e(AsyncCallback asyncCallback, Object asyncState) +446

I made some searches and I think it may be related to my model?

The ViewModel is defined this way:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using CardNumbers.Objects;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

using DataAnnotationsExtensions;
using System.ComponentModel.DataAnnotations.Schema;

namespace CardNumbers.Models
{
    public class ClientViewModel
    {
        public Client Client { get; set; }

        [Key]
        [Editable(false)]
        [Column("ClientId", TypeName = "int")]
        public virtual int? ClientId
        {
            get
            {
                if (Client == null)
                    return null;
                else
                    return Client.Id;
            }

            set { Client.Id = value ?? 0; }
        }
        [Required]
        [DisplayName("Client No")]
        [UIHint("Number")]
        [Column("client_no", TypeName = "smallint")]
        [Remote("doesClientNoExist", "Client", HttpMethod = "POST",
            AdditionalFields = "ClientId",
            ErrorMessage = "Client Number already exists. Please enter a different Client Number.")]
        public virtual Int16 ClientNumber
        {
            get
            {
                if (Client == null)
                    return 0;
                else
                    return Client.Number;
            }

            set { Client.Number = value; }
        }

        [Required]
        [Column("client_name", TypeName = "varchar")]
        [DisplayName("Client Name")]
        [MaxLength(30, ErrorMessage = "Client Name should not be longer than 30 characters")]
        [MinLength(3, ErrorMessage = "Client Name is too short")]
        [Remote("doesClientNameExist", "Client", HttpMethod = "POST", AdditionalFields = "ClientId",
            ErrorMessage = "Client Name already exists. Please enter a different Client Name.")]
        public virtual string ClientName
        {
            get
            {
                if (Client == null)
                    return "";
                else 
                    return Client.Name;            
            }

            set { Client.Name = value; }
        }

        public int id { get; set; }
       /// <summary>
       /// Public constructor
       /// </summary>
       /// <param name="client"></param>
        public ClientViewModel(Client client = null)
        {
           if (client != null)
              this.Client = client;
           else
              this.Client = new Client();
        }
    }
}

Could the error above be related to that public constructor? But I am using default value for the parameter in the constructor, so I don't think it means I do not have constructor without parameter?

Can someone please lend a hand as where to look for the problem?

My dialog is defined this way:

var $dlg = $("#add-edit-dialog").dialog({
   autoOpen: false,
   show: "blind",
   closeOnEscape: true,
   resizable: true,
   width: 1200,
   height: 750,
   minHeight: 600,
   minWidth: 950,
   buttons: {
      Save: function () {

         if ($("#add-edit-form").valid()) {

            var urlLoc = '/Client/Edit/' + currentId;
            if ($('#fntype').val() === "Add")
               urlLoc = '/Client/Add';
           
            var form = $('form', this);
            debugger;
            var oForm = form.serialize();
            oForm = oForm.concat($('#frmClientsSearch').serialize());

            $.ajax({
               type: 'POST',
               url: urlLoc,
               data: oForm,
               dataType: 'json',
             
               cache: false,
               //contentType: 'application/json',
               success: function (result) {
                  debugger;
                  $('#flexClients').flexAddData(result);
               }
            });
            $(this).dialog('close');
         } else return false;

      },
      Cancel: function () {
         $(this).dialog("close");
         clearForm();
         if (validator)
            validator.resetForm();
      }
   },
   close: function () { clearForm(); },
   open: function () {
   }
});

Thanks a lot in advance.