in c#, how can i build up array from A to ZZ that is similar to the way that excel orders columns

Question

i am looking for code that can generate an array where the first item is A, then B, then C . . .after Z i

Answer 1

var q = Enumerable.Range(Convert.ToInt32('A'),26).Select( x => Convert.ToChar(x) );
var result = (
  q.Select( x => x.ToString() )
   .Concat( 
      q.SelectMany(
        x => q.Select( y => x.ToString() + y.ToString() )
      )
   )
);