C# - Appending text files

Question

I have code that reads a file and then converts it to a string, the string is then written to a new file, although could someone demonstrate how to append this string to the

Answer 1

Try

StreamWriter writer = File.AppendText("C:\\test.txt");
writer.WriteLine(mystring);

Answer 2

If the file is small, you can read and write in two code lines.

var myString = File.ReadAllText("c:\\test.txt");
File.AppendAllText("c:\\test2.txt", myString);

If the file is huge, you can read and write line-by-line:

using (var source = new StreamReader("c:\\test.txt"))
using (var destination = File.AppendText("c:\\test2.txt"))
{
    var line = source.ReadLine();
    destination.WriteLine(line);
}

Answer 3

using(StreamWriter file = File.AppendText(@"c:\test2.txt"))
{
    file.WriteLine(myString);
}

Answer 4

Use File.AppendAllText

File.AppendAllText("c:\\test2.txt", myString)

Also to read it, you can use File.ReadAllText to read it. Otherwise use a using statement to Dispose of the stream once you're done with the file.