title: How to get only first letters from string in C#
body: <p>I am new to C# and I am using windows forms.
  I am dealing with Postcodes string and I am trying to get the first letters from the Post code and store it in a variable, for example:</p>
  
  <p>BL9 8NS    (I want to get BL)</p>
  
  <p>L8 6HN     (I want to get L)</p>
  
  <p>CH43 7TA   (I want to get CH)</p>
  
  <p>WA8 7LX    (I want to get WA)</p>
  
  <p>I just want to get the first letters before the number and as you can see the number of letters can be 1 or 2 and maybe 3.
  Anyone knows how to do it?  Thank you</p>