C# - How to count Words and letters from a .RTF / .TXT File?

The Title says everything..

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For .txt file you can use regexp \b\w+\b. It will match all occurrences of words, e.g.:

var count = Regex.Matches(input, @"\b\w+\b").Count;

To count letters:

int count = input.Count(char.IsLetter);

static void Main()
{
     const string t1 = "To be or not to be, that is the question.";
     Console.WriteLine(WordCounting.CountWords1(t1));
     Console.WriteLine(WordCounting.CountWords2(t1));

     const string t2 = "Mary had a little lamb.";
     Console.WriteLine(WordCounting.CountWords1(t2));
     Console.WriteLine(WordCounting.CountWords2(t2));
}

more is here

getting text from rtf - Get plain text from an RTF text

count words in text - http://www.dotnetperls.com/word-count