Open existing file, append a single line

Question

I want to open a text file, append a single line to it, then close it.

Answer 1

Might want to check out the TextWriter class.

//Open File
TextWriter tw = new StreamWriter("file.txt");

//Write to file
tw.WriteLine("test info");

//Close File
tw.Close();

Answer 2

using (StreamWriter w = File.AppendText("myFile.txt"))
{
  w.WriteLine("hello");
  w.Flush();
  w.Close();
}

Answer 3

using (StreamWriter w = new StreamWriter(path))
{
    w.WriteLine(line);
}

Answer 4

You can use File.AppendAllText for that:

File.AppendAllText(@"c:\path\file.txt", "text content" + Environment.NewLine);

Answer 5

File.AppendText will do it:

using (StreamWriter w = File.AppendText("textFile.txt")) 
{
    w.WriteLine ("-------HURRAY----------");
    w.Flush();
}