Visit Stream I/O to know more about Stream and its class hierarchy.
The following example shows how StreamWriter makes it easy to write strings to a File:
//Create object of FileInfo for specified path
FileInfo fi = new FileInfo(@"D:\DummyFile.txt");
//Open file for Read\Write
FileStream fs = fi.Open(FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read );
//Create StreamWriter object to write string to FileSream
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine("Another line from streamwriter");
sw.Close();
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