How do I find the word in the file?

If the file is not too big, I'd load it into memory and then use a regular expression to find the word:

using System;

using System.IO;

using System.Text.RegularExpressions;

class Test

{

static void Main()

{

string filePath = "dimitri.txt";

string text = File.ReadAllText(filePath);

string wordToFind = "whatever";

string regExp = @"\b" + wordToFind + @"\b";

MatchCollection mc = Regex.Matches(text, regExp);

Console.WriteLine("{0} occurrence(s) of {1} were found", mc.Count, wordToFind);
Console.ReadKey();

}