How to make WPF input control show virtual Keyboard when it got focus in touch screen

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Try this,

First check for a physical keyboard presence:

KeyboardCapabilities keyboardCapabilities = new Windows.Devices.Input.KeyboardCapabilities();
return  keyboardCapabilities.KeyboardPresent != 0 ? true : false;

If you do not find a physical keyboard, use the in-built virtual keyboard of windows:

Process.Start(Environment.GetFolderPath(Environment.SpecialFolder.System) + Path.DirectorySeparatorChar + "osk.exe");

Got help from here:
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