Files

Using System.IO;
s
String path= @"D:\Example.txt";

Example.txt

DS
DAA
DotNet
C#


if (File.Exists(path))
{
console.writeline("File is present on disk");
}

e.g
String str;
str= File.ReadAllText(path);

File.Delete(path);

Copy File
String path= @"D:\Example.txt";
String copypath= @"E:\Example1.txt";

File.copy(path,copypath)


Streams

string []subject = new String[]{"DS","DAA","DotNet"};

using (StreamWriter sw = new StreamWriter("D:\Example.txt"))
{
	foreach(string s in subject)
	{
	sw.writeline(s);	
	}
}

console.writeline("File conteents are")
String line;
using (StreamReader sr = new StreamReader("D:\Example.txt"))
{
while((line= sr.readline) !=null)
{
console.writeline(line);
}
}