title: Iterating through the Alphabet - C# a-caz
body: <p>I have a question about iterate through the Alphabet.
  I would like to have a loop that begins with "a" and ends with "z". After that, the loop begins "aa" and count to "az". after that begins with "ba" up to "bz" and so on...</p>
  
  <p>Anybody know some solution?</p>
  
  <h2>Thanks</h2>
  
  <p>EDIT: I forgot that I give a char "a" to the function then the function must return b. if u give "bnc" then the function must return "bnd"</p>