Word Count In Text File

public static void wordscount(string word, string path)
{
    int index;
    int occurrence = 0;

    try
    {
        StreamReader reader1 = new StreamReader(path);
        using(reader1)
        {
            string line = reader1.ReadLine();

            while (line != null)
            {
                index = line.IndexOf(word);
                while (index != -1)
                {
                    occurrence++;
                    index = line.IndexOf(word,(index + 1));

                }

                   line = reader1.ReadLine();
            }

            Console.WriteLine("the word {0} occours in {1} times", word, occurrence);

        }
    }
    catch (Exception ex)
    {

        Console.WriteLine(ex.Message);
    }

    Console.ReadLine();
}