[Solved] Console Application to count all ‘#’ characters in a text file

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The problem is that ‘#’ (symbol your looking for) is a special symbol in regular expressions
and so, should be escaped:

static void Main(string[] args) {
  //String fileName = @"C:\Documents and Settings\9chat73\Desktop\count.txt"; 

  // To search dinamically, just ask for a file:
  Console.WriteLine("Enter a file to search");
  String fileName = Console.ReadLine().Trim(); 

  if (File.Exists(fileName)) {
    Console.WriteLine("Enter a word to search");
    String pattern = Console.ReadLine().Trim();

    // Do not forget to escape the pattern! 
    int count = Regex.Matches(File.ReadAllText(fileName), 
                              Regex.Escape(pattern), 
                              RegexOptions.IgnoreCase).Count;

    Console.WriteLine(count.ToString());
  }

  Console.ReadLine();
}

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solved Console Application to count all ‘#’ characters in a text file