Before using
------------
The KeyboardStringReader needs a reference to System.Windows.Forms in order to get the capslock and numlock states, so a reference will need to be added to the XNA project.
How to use
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KeyboardStringReader textReader = new KeyboardStringReader();
StringBuilder inputText = new StringBuilder();
protected override void Update(GameTime gameTime)
{
KeyboardState keyboard = Keyboard.GetState();
this.textReader.Process(keyboard, gameTime, this.inputText);
}