how to count the occurrence of a word in a text file using c#

WordCount.cs

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

            try 
            {
	            StreamReader reader = new StreamReader(path);

                using(reader)
	            {
                    string line = reader.ReadLine();

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

                        line = reader.ReadLine();         
	                }

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

		
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.Message);
            }
            
            Console.ReadLine();
        }