No parameterless constructor would indicate nothing is being sent from jquery. Put in some Alert boxes to test for specific values.

>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.