title: C#: Check for unsupported characters/glyphs in a font
body: <p>I am working on a translation software add in (C#, .NET 2.0) which displays translated texts in a emulated device display.
  I have to check if all translated texts could be displayed with specified fonts (Windows TTF).
  But I didn't found any way to check a font for unsupported glyphs.
  Does anyone have an idea?</p>
  
  <p>Thanks</p>