Question

The following program should open/create a file and write the current date to it’s end every time.

using System;
using System.IO;
using System.Text;


namespace roughDraft
{
    class Program
    {
        public static void Main()
        {
            StreamWriter oFile = File.AppendText("baza.txt");
            string output = "Current date and time: " + DateTime.Now.ToString("yyyy.MM.dd hh:mm:ss");


            oFile.WriteLine(output);

            Console.WriteLine(output);

            Console.ReadKey();
        }
    }
}

I don’t know why does it only create an empty file.

Answer 1

You should always put StreamWriter objects in a using statement so they get closed properly.

using (StreamWriter oFile = File.AppendText("baza.txt"))
{
    string output = "Current date and time: " 
                  + DateTime.Now.ToString("yyyy.MM.dd hh:mm:ss");
    oFile.WriteLine(output);
}

Alternatively, you can manually call the Close method on the StreamWriter, but the using statement, to me, is much easier and less error-prone.