C#.NET - Reading data from a text file

Here's a simple sample

using System;
using System.IO;  // Contains File class

class Demo {
   static void Main(string[] args) {
      // The file can be anywhere you like.
      String path1 = @"C:\Temp\MyFile.txt";
      // In debug mode, running from IDE default location is YourProgram\bin\debug
      String path2 = "InDebugFolder.txt";
      if (!File.Exists(path2)) {
         Console.WriteLine("{0} doesn't exist.",path2);
      } else {
         // A StreamReader is a convenient, read-only, forward-only way to read a text file
         // Placing StreamReader in a using statement ensures the stream gets closed on exit
         using (StreamReader sr = File.OpenText(path2)) {
            Method1(sr);
        }
      }
   }

   static void Method1(StreamReader sr) {
      // Your processing here
   }
}

ok, and what if I did want to write to file also?