Return the most common character that appears first

FirstMostCommonCharacter

public static char FirstMostCommonCharacter(string text)
{
    return text
        .GroupBy(c => c)
        .OrderByDescending(c => c.Count())
        .Where(c => c.Key != ' ')       // dont include white space
        .Select(c => c.Key)
        .FirstOrDefault();
}