Comments by zlanizer (Top 1 by date)

Reason for my vote of 1
it's your bad try
// get first letter from string array
private IEnumerable<char> getFirstLetter(IEnumerable<string> stringArray)
{
if (stringArray == null) throw new ArgumentNullException("stringArray");
return stringArray.Where(item => item != null).Select(item => item.First());
}