how to sum a column in datatable

If untyped (replace int with the correct data type):

 var sum = table.AsEnumerable().Sum(x=>x.Field<int>(3));

or:

 var sum = table.AsEnumerable().Sum(x=>x.Field<int>("SomeProperty"));

If typed:

 var sum = table.Sum(x=>x.SomeProperty);

Background worker

http://elegantcode.com/2009/07/03/wpf-multithreading-using-the-backgroundworker-and-reporting-the-progress-to-the-ui/

Sending Key or simulation Key press

 if (e.Key == Key.Down)
        {
            e.Handled = true;
            KeyEventArgs eInsertBack = new KeyEventArgs(Keyboard.PrimaryDevice, 

 Keyboard.PrimaryDevice.ActiveSource, 0, Key.Tab);
            eInsertBack.RoutedEvent = UIElement.KeyDownEvent;
            InputManager.Current.ProcessInput(eInsertBack);
        }

Tab order not working in WPF

<TabControl TabIndex="4" KeyboardNavigation.TabNavigation="Local">

How to run WPF - XBAP as Full Trust Application

How to run WPF - XBAP as Full Trust Application

Recently I work on WPF-XBAP application that will run from intranet website: