.NET Framework Standard Library Annotated Reference, Volume 1: Base Class Library and Extended Numerics Library

Example

using System;
using System.IO;
using System.Text;

namespace Samples
{
  public class TextWriterSample
  {
    public static void Main()
    {
      string s = "textwriter.txt";
      using(TextWriter tw = new StreamWriter(s))
      {
        DisplayInformation(tw);
        tw.WriteLine(DateTime.Now.ToString());
      }
    }
    public static void DisplayInformation(TextWriter tw)
    {
      Console.WriteLine("Encoding: {0}", tw.Encoding);
      Console.WriteLine("Format provider: {0}",
                        tw.FormatProvider);
    }
  }
}

The output is

Encoding: System.Text.UTF8Encoding
Format provider: en-AU