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After reading an article about fonts, i tried the code and i am getting same results as show in the article but i can't figure out what those numbers XXX:XXX represent. Are they ascii values or what? What link should i read to understand about Typeface, GlyphTypeface mentioned in the answer?

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You quote an article and dont bother reading it and looking it up in the documentation regarding the code sample? Must be a new professional attitude. –  TomTom Mar 22 '12 at 6:05
I read it that why tried running its code but couldn't understand its outcome. as simple as that. looks like not reading people question carefully is the new professional attitude.. –  Nikhil Agrawal Mar 22 '12 at 6:08
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up vote 3 down vote accepted

Well - those numbers xxx:xxx is actual a pair - left number indicates unicode code point (i.e. unicode character code) and right side indicates the index to the glyph in the font file.

AFAIK, in very simple terms, glyph is a character representation i.e. how a character would look in a particular font/type-face. You may have a same glyph used for multiple characters and hence index in glyph tables is used. Typography is a involved subject and you can find a lot of material online - search for it. Here are few wikipedia pages that may get you started:

http://en.wikipedia.org/wiki/Glyph (see typography entry)

MSDN also has a lot of documentation (e..g http://msdn.microsoft.com/en-us/library/system.windows.media.glyphtypeface.aspx) but you need to get some basic background before that.

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