This document contains code examples of using streams in C# for reading and writing files. It demonstrates creating a FileStream and using StreamReader to read the contents of a file line by line. Another example shows using StreamWriter to write lines of text to a file. It also briefly explains the Stream, StreamReader, and StreamWriter classes and their uses for transferring bytes and reading/writing strings from streams.

1. using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Please enter a name for the new directory:");
string DirName = Console.ReadLine();
// Checking if string is empty or not
if (DirName != String.Empty)
{
// Creating the Directory
Directory.CreateDirectory("D:"+DirName);
// Checking Directory is created
// Successfully or not
if (Directory.Exists(DirName))
{
Console.WriteLine("The directory was created!");
Console.ReadKey();
}
}
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter the directory name you want to delete:");
string DirName = Console.ReadLine();
if (Directory.Exists("D://"+DirName))
{
Directory.Delete("D://"+DirName);
if(Directory.Exists("D://"+DirName) == false)
{
Console.WriteLine("Directory deleted successfully...");
}
}
else
{
Console.WriteLine("Directory {0} does not exist!", DirName);
Console.ReadLine();
}
}
}
}

2. C# - Stream
C# includes following standard IO (Input/Output) classes to read/write from different sources like files, memory,
network, isolated storage, etc.
Stream: System.IO.Stream is an abstract class that provides standard methods to transfer bytes (read, write,
etc.) to the source. It is like a wrapper class to transfer bytes. Classes that need to read/write bytes from a
particular source must implement the Stream class.
StreamReader: StreamReader is a helper class for reading characters from a Stream by converting bytes into
characters using an encoded value. It can be used to read strings (characters) from different Streams like
FileStream, MemoryStream, etc.
StreamWriter: StreamWriter is a helper class for writing a string to a Stream by converting characters into
bytes. It can be used to write strings to different Streams such as FileStream, MemoryStream, etc.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
//Create object of FileInfo for specified path
FileInfo fi = new FileInfo(@"D:skcollegeDummyFile.txt");
//Open file for ReadWrite
FileStream fs = fi.Open(FileMode.OpenOrCreate,FileAccess.Write, FileShare.Write);
//Create StreamWriter object to write string to FileSream
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine("line 1 from streamwriter");
sw.WriteLine("line 2 line from streamwriter");
sw.Close();
}
}
}
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
FileInfo fi = new FileInfo(@"D:skcollegeDummyFile.txt");
FileStream fs = fi.Open(FileMode.Open, FileAccess.Read, FileShare.Read);

3. StreamReader sr = new StreamReader(fs);
string fileContent = sr.ReadToEnd();
Console.WriteLine(fileContent);
sr.Close();
fs.Close();
Console.ReadLine();
// Line by Line Reading
1.// Write file contents on console.
2. using (StreamReader sr = File.OpenText(fileName))
3. {
4. string s = "";
5. while ((s = sr.ReadLine()) != null)
6. {
7. Console.WriteLine(s);
8. }
9. }
}
}
}
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The BinaryReader and BinaryWriter classes are used for reading from and writing to a binary file.
The BinaryReader and BinaryWriter classes are used for reading from and writing to a binary file.