how to Convert Text To hex An hex To text ?

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C#5.0

hello guys.

I want to Convert Text To hex By clicking button like this :

http://oi61.tinypic.com/2z53omd.jpg[^]


And Convert Hex To text By clicking button like this :
http://oi61.tinypic.com/v2wmtz.jpg[^]

I read This COde :

http://snipplr.com/view/36461/[^]
and
http://www.nullskull.com/faq/834/convert-string-to-hex-and-hex-to-string-in-net.aspx[^]

but I cant use. cuz im new.. plz help to Convert By clicking Button