CamelCase to human readable

CamelCase.cs

public static string SplitUpperCaseToString(this string source) {
  return string.Join(" ", SplitUpperCase(source));
}
 
public static string[] SplitUpperCase(this string source) {
  if (source == null) {
    return new string[] {}; //Return empty array.
  }
  if (source.Length == 0) {
    return new string[] {""};
  }
 
  StringCollection words = new StringCollection();
  int wordStartIndex = 0;
 
  char[] letters = source.ToCharArray();  char previousChar = char.MinValue;
  // Skip the first letter. we don't care what case it is.
  for (int i = 1; i < letters.Length; i++) {
    if (char.IsUpper(letters[i]) && !char.IsWhiteSpace(previousChar)) {
      //Grab everything before the current character.
      words.Add(new String(letters, wordStartIndex, i - wordStartIndex));
      wordStartIndex = i;
    }    previousChar = letters[i]; 
  }

  //We need to have the last word.
  words.Add(new String(letters, wordStartIndex,     letters.Length - wordStartIndex)); 
 
  string[] wordArray = new string[words.Count];
  words.CopyTo(wordArray, 0);
  return wordArray;
}

https://haacked.com/archive/2005/09/23/splitting-pascalcamel-cased-strings.aspx/