hey guys i have a textfile i have divided it into 4 parts. i want to search each part for the words that appear in each part and score that word

exmaple

welcome to the national basketball finals,the basketball teams here today have come a long way. without much delay lets play basketball.

i will want to return national = 1 as it appears only in one part etc

am working on determining text context using word position.

am working with c# and not very good in text processing basically if a word appears in the 4 sections it scores 4 if a word appears in the 3 sections it scores 3 if a word appears in the 2 sections it scores 2 if a word appears in the 1 section it scores 1

thanks in advance

so far i have this

var s = "welcome to the national basketball finals,the basketball teams here today have come a long way. without much delay lets play basketball. ";

    var numberOfParts = 4;

    var eachPartLength = s.Length / numberOfParts;

    var parts = new List<string>();

    var words = Regex.Split(s, @"\W").Where(w => w.Length > 0); // this splits all words, removes empty strings

    var wordsIndex = 0;

    for (int i = 0; i < numberOfParts; i++)
    {

        var sb = new StringBuilder();

        while (sb.Length < eachPartLength && wordsIndex < words.Count())
        {

            sb.AppendFormat("{0} ", words.ElementAt(wordsIndex));

            wordsIndex++;

        }


        // here you have the part

        Response.Write("[{0}]"+ sb);

        parts.Add(sb.ToString());

        var allwords = parts.SelectMany(p => p.Split(' ').Distinct());

       var wordsInAllParts = allwords.Where(w => parts.All(p => p.Contains(w))).Distinct();