C#

<telerik:RadTreeView Width="200" 
                     HorizontalAlignment="Left"
                     ItemsSource="{Binding Path=Clients}"
                     SelectedItem="{Binding SelectedItem, Mode=TwoWay}"/>

private void nodeSelected()
{
    if (SelectedItem == null)
        return;

    string selectedObjectName = SelectedItem.GetType().Name.Trim().ToLower();

    switch (selectedObjectName)
    {
        #region Client
        case "clientmodel":

            // Get the client model from the selected tree node
            ClientModel clientModel = SelectedItem as ClientModel;

            // Check to see if a view with the client's Id is already open in a tab
            TabInfo clientTabInfo = getTabInfo(AppViews.Client, clientModel.ClientId);

            if (clientTabInfo == null)
            {
                string clientName = "Client - " + clientModel.ClientName;
                string clientImage = "/Falcon;component/Media/Graphics/customer_48x48.png";
                string clientIcon = "/Falcon;component/Media/Graphics/customer_16x16.png";

                // Create the client view model, passing in the client model
                ClientViewModel clientViewModel = new ClientViewModel(clientModel)
                {
                    HeaderTitle = clientName,
                    HeaderImage = clientImage
                };

                // Create the client view
                ClientView clientView = new ClientView
                { 
                    /* Assign the client view model to its view */
                    DataContext = clientViewModel };

                // Create the tab info object and add it to the list
                TabInfo info = new TabInfo
                {
                    ItemId = clientModel.ClientId,
                    ViewType = AppViews.Client
                };

                // Assign the Client's view and the tab info object to the tab
                // Create the new tab
                RadTabItem tab = addTab(clientName, clientIcon);
                tab.Content = clientView;
                tab.Tag = info;

                // Add the tab to the Tabs collection and select it
                Tabs.Add(tab);
                SelectedTab = tab;
            }
            else
            {
                // Actvate the tab
                activateTab(AppViews.Client, clientModel.ClientId);
            }
            break;

        #endregion

        #region Project
        case "projectmodel":

            // Get the client model from the selected tree node
            ProjectModel ProjectModel = SelectedItem as ProjectModel;

            // Check to see if a view with the Project's Id is already open in a tab
            TabInfo projectTabInfo = getTabInfo(AppViews.Project, ProjectModel.ProjectId);

            if (projectTabInfo == null)
            {
                string projectName = "Project - " + ProjectModel.Caption;
                string projectImage = "/Falcon;component/Media/Graphics/project_48x48.png";
                string projectIcon = "/Falcon;component/Media/Graphics/project_16x16.png";

                // Create the Project view model, passing in the Project model
                ProjectViewModel ProjectViewModel = new ProjectViewModel(ProjectModel)
                {
                    HeaderTitle = projectName,
                    HeaderImage = projectImage
                };

                // Create the Project view
                ProjectView ProjectView = new ProjectView();

                // Assign the Project view model to its view
                ProjectView.DataContext = ProjectViewModel;

                // Create the tab info object and add it to the list
                TabInfo info = new TabInfo
                {
                    ItemId = ProjectModel.ProjectId,
                    ViewType = AppViews.Project
                };

                // Create the new tab
                RadTabItem tab = addTab(projectName, projectIcon);
                tab.Content = ProjectView;
                tab.Tag = info;

                // Add the tab to the Tabs collection and select it
                Tabs.Add(tab);
                //SelectedTabIndex = Tabs.Count - 1;
                SelectedTab = tab;
            }
            else
            {
                // Actvate the tab
                activateTab(AppViews.Project, ProjectModel.ProjectId);
            }
            break;
        #endregion
    }

}

htcActiveBindingSource.DataSource = this.htcTableAdapter.ActiveGetDataBy(gpn);
htcCancelledBindingSource.DataSource = this.htcTableAdapter.CancelledGetDataBy(gpn);
vetActiveBindingSource.DataSource = this.vetTableAdapter.ActiveGetDataBy(gpn);
vetCancelledBindingSource.DataSource = this.vetTableAdapter.CancelledGetDataBy(gpn);

this.Validate();
this.htcActiveBindingSource.EndEdit();
this.htcCancelledBindingSource.EndEdit();
this.vetActiveBindingSource.EndEdit();
this.vetCancelledBindingSource.EndEdit();
this.tableAdapterManager.UpdateAll(this.cramdDataSet);

this.htcTableAdapter.ActiveFillBy(this.cramdDataSet.htc, gpn);

- USBDriver
  - amd64
  | \ ftbusui.dll
  | \ ftcserco.dll
  | \ ftd2xx.lib
  | \ ftd2xx64.dll
  | \ ftdibus.sys
  | \ ftlang.dll
  | \ ftser2k.sys
  | \ ftserui2.dll
  - i386
  | \ ftbusui.dll
  | \ ftcserco.dll
  | \ ftd2xx.dll
  | \ ftd2xx.lib
  | \ ftdibus.sys
  | \ ftlang.dll
  | \ ftser2k.sys
  | \ ftserui2.dll
  - Static
  | - amd64
  | | \ ftd2xx.lib
  | - i386
  |   \ ftd2xx.lib
  \ DPInst.exe
  \ dpinst.xml
  \ ftd2xx.h
  \ ftdibus.cat
  \ ftdibus.inf
  \ ftdiport.cat
  \ ftdiport.inf

-USBDriver
  - amd64
  | \ ftbusui.dll
  | \ ftcserco.dll
  | \ ftd2xx64.dll
  | \ ftlang.dll
  | \ ftserui2.dll
  - i386
  | \ ftbusui.dll
  | \ ftcserco.dll
  | \ ftd2xx.dll
  | \ ftlang.dll
  | \ ftserui2.dll
  \ DPInst.exe
  \ dpinst.xml
  \ ftd2xx.h
  \ ftdibus.inf
  \ ftdiport.inf

List<Students> list = students.ToList<Students>()