Question

So I have a function call classifier that basically check all text file in a directory, if there is any text file contains more than 50 line of words, then classify that text file into a type using other class called Text_Classification which I am sure its correct and error free. After classification, I will need to clean that text file and write a “Lines” as a first new line on that text file (this is for other class, so dont bother 🙂 ).
But I got an exception, which mean there is something wrong in the try{} block.

Any idea why?

static void classifer(object state) {
    Console.WriteLine("Time to check if any log need to be classified");
    string[] filename = Directory.GetFiles(@"C:\Users\Visual Studio 2010\Projects\server_test\log");
    foreach(string textfile_name in filename) {
        var lineCount = File.ReadAllLines(textfile_name).Length;
        if(lineCount > 50) {
            Console.WriteLine("Start classifying 1 of the logs");
            Text_Classification classifier = new Text_Classification(textfile_name, 1);
            string type = classifier.passBack_type();  //this function passes back the type of the log(text file)
            Console.WriteLine(type);
            try {
                TextWriter tw = new StreamWriter(textfile_name); //clean the text file
                tw.WriteLine(" ");
                tw.Close();
                TextWriter tw2 = new StreamWriter(textfile_name, true);  //append <Lines> as the first new line on the text file
                tw2.WriteLine("Lines");
                tw2.Close();
            }
            catch {
                Console.WriteLine("cant re-write txt");
            }
        }
    }
}

Answer 1

As discussed, this line is the culprit:

Text_Classification classifier = new Text_Classification(textfile_name, 1);

The class Text_Classification is opening and not closing the file textfile_name.