Question

Can I write line of text into file and see changes after each call WriteLine? Now I see changes in this file only after closing StreamWriter.

StreamWriter sw = new StreamWriter(string path);
sw.WriteLine("text");

in this place I want to preview my file

sw.Close();

now I see writed line only in this moment

Answer 1

Output to the StreamWriter is buffered by default.
Try this:

sw.AutoFlush = true;

See here http://msdn.microsoft.com/en-us/library/system.io.streamwriter.autoflush.aspx