DataForm1.C...= new PlanAdd() 

[Display(Name = "Код специальности")]
        public string name { get; set; }

Код специальности   _____________________ //Форма для ввода

  <toolkit:DataField Label="Имя">
             <TextBox Text="{Binding Path=name, Mode=TwoWay}"/>
  </toolkit:DataField>

    public partial class Page_add : Page
    {
        private z_plan_name newRecord { get; set; }
        public Page_add()
        {
            InitializeComponent();
            this.newRecord = new z_plan_name(); 
          

        }

        // Выполняется, когда пользователь переходит на эту страницу.
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            this.DFAdd_Plan.CurrentItem = this.newRecord;
        }

            private void SubmitCompleted(System.ServiceModel.DomainServices.Client.SubmitOperation obj)
        {
            {
                this.biLoading.IsBusy = false;
                if (obj.HasError)
                {
                    obj.MarkErrorAsHandled();
                    MessageBox.Show(obj.Error.Message);
                }
                else
                {
                    this.NavigationService.ShowPrevPage();
                }
            }
        }
   
        private void btnSaveRecord_Click(object sender, RoutedEventArgs e)
        {
            this.newRecord = new z_plan_name();
            if (ResourceWrapper.CurrentDomainContext == null)
            {
                return;
            }
            if (this.DFAdd_Plan.CommitEdit())
            {
                ResourceWrapper.CurrentDomainContext.z_plan_names.Add(this.newRecord);
                ResourceWrapper.CurrentDomainContext.SubmitChanges(SubmitCompleted, null);
            }
        }

<TextBox Text="{Binding Path=name, Mode=OneTime, [color=black]ValidatesOnExceptions=true[/color]}"/>

Submit operation failed validation. Please inspect Entity. 
ValidationErrors for each entity in EntitiesError for more information.

[id]
[kod_speciality]
[name]
[speciality]
[user]
[delete]
[remark]

 <toolkit:DataForm x:Name="DFAdd_Plan" Height="266">
                <toolkit:DataForm.NewItemTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <toolkit:DataField Label="Имя">
                                    <TextBox Text="{Binding Path=name, Mode=TwoWay}"/>
                            </toolkit:DataField>
                             <toolkit:DataField Label="Код специальности">
                                    <TextBox Text="{Binding Path=kod_speciality, Mode=TwoWay}"/>
                             </toolkit:DataField>
                            </StackPanel>
                    </DataTemplate>
                </toolkit:DataForm.NewItemTemplate>
            </toolkit:DataForm>

ResourceWrapper.CurrentDomainContext.SubmitChanges(SubmitCompleted, null);

 this.newRecord = new z_plan_name();

 private void btnSaveRecord_Click(object sender, RoutedEventArgs e)
        {
            this.newRecord = new z_plan_name();
            if (ResourceWrapper.CurrentDomainContext == null)
            {
                return;
            }
            if (this.DFAdd_Plan.CommitEdit())
            {
                ResourceWrapper.CurrentDomainContext.z_plan_names.Add(this.newRecord);
                ResourceWrapper.CurrentDomainContext.SubmitChanges(SubmitCompleted, null);
            }
        }

      [Display(Name = "Код специальности", Description = "Введите код специальности вида XXXXXX")]
        public string name { get; set; }
        [Display (Name = "Наименование специальности", Description = "Вводим все что хотим")]
        public string name_plan { get; set; }
        [Display (Name = "Примечание", Description="Примечание к плану. Поле необязательное к заполнению")]
        public string remark { get; set; }
    }

ChildWindow1 Plan = new ChildWindow1();
Plan.Show();

this.frame1.Navigate(new Uri("/Authorization/Authorization.xaml", UriKind.Relative));

 Child_Window_Plan childWindow = TreeHelper.FindVisualParent<Child_Window_Plan>(this);
            if (childWindow != null)
            {
                //Грузим в Frame страницу Page_add.xaml
                NavigationService.Navigate(new Uri("/Plan/Page_add.xaml", UriKind.RelativeOrAbsolute));
            }

                NavigationService.Navigate(new Uri("/Plan/Page_add.xaml", UriKind.RelativeOrAbsolute));

 Child_Window_Plan childWindow = TreeHelper.FindVisualParent<Child_Window_Plan>(this);
            if (childWindow != null)
            {
                //Грузим в Frame страницу Page_add.xaml
                NavigationService.Navigate(new Uri("/Plan/Page_add.xaml", UriKind.RelativeOrAbsolute));
            }

NavigationService.Navigate(new Uri("/Plan/Page_add.xaml", UriKind.RelativeOrAbsolute));