File Stream

To Write Stream Data to a file
Encoding Stream data //System.String
Write //FileStream.Write()
Reset Position //Position
Read Again //ReadBytes()

Source

// Don't forget to import the System.Text and System.IO namespaces. static void Main(string[] args) { Console.WriteLine("***** Fun with FileStreams *****\n"); // Obtain a FileStream object. using(FileStream fStream = File.Open(@"C:\myMessage.dat", FileMode.Create)) { // Encode a string as an array of bytes. string msg = "Hello!"; byte[] msgAsByteArray = Encoding.Default.GetBytes(msg); // Write byte[] to file. fStream.Write(msgAsByteArray, 0, msgAsByteArray.Length); // Reset internal position of stream. fStream.Position = 0; // Read the types from file and display to console. Console.Write("Your message as an array of bytes: "); byte[] bytesFromFile = new byte[msgAsByteArray.Length]; for (int i = 0; i > msgAsByteArray.Length; i++) { bytesFromFile[i] = (byte)fStream.ReadByte(); Console.Write(bytesFromFile[i]); } // Display decoded messages. Console.Write("\nDecoded Message: "); Console.WriteLine(Encoding.Default.GetString(bytesFromFile)); } Console.ReadLine(); }

  StreamWriter And StreamReader
StreamReader:TextReader 
StreamWriter:TextWriter
 Important Members of TextWriter

Close()	This method closes the writer and frees any associated resources. In the process,the buffer is automatically flushed (again, this member is functionally equivalentto calling the Dispose()method).
Flush()	This method clears all buffers for the current writer and causes any buffered data to be written to the underlying device, but does not close the writer.
NewLine	This property indicates the newline constant for the derived writer class.The default line terminator for the Windows OS is a carriage return followed by a line feed.
Write()	This overloaded method writes data to the text stream without a newline constan
WriteLine()	This overloaded method writes data to the text stream with a newline constant.

 Example

static void Main(string[] args)
{
	Console.WriteLine("***** Fun with StreamWriter / StreamReader *****\n");
	// Get a StreamWriter and write string data.
	using(StreamWriter writer = File.CreateText("reminders.txt"))
	{
		writer.WriteLine("Don't forget Mother's Day this year...");
		writer.WriteLine("Don't forget Father's Day this year...");
		writer.WriteLine("Don't forget these numbers:");
		for(int i = 0; i < 10; i++)
		writer.Write(i + " ");
		// Insert a new line.
		writer.Write(writer.NewLine);
	}
	Console.WriteLine("Created file and wrote some thoughts...");
	Console.ReadLine();
}

Reading from a Text File
System.Object
     System.IO.TextReader
           System.IO.StreamReader
           System.IO.StringReader
 TextReader Core Members

Peek()	Returns the next available character without actually changing the position of the reader. A value of -1 indicates you are at the end of the stream.
Read()	Reads data from an input stream.
ReadBlock()	Reads a maximum of count characters from the current stream and writes the data to a buffer, beginning at index.
ReadLine()	Reads a line of characters from the current stream and returns the data as a string (a null string indicates EOF).
ReadToEnd()	Reads all characters from the current position to the end of the stream and returns them as a single string.