Introduction:
In this article, i am going to demonstrate how to create,read,write a binary file using C# 4.0.

Main:
When you open files in binary mode, you get back a stream that you can
control more precisely than with text.

See this below simple examble,

class Program { static void Main(string[] args) { if (args.Length < 2) { Console.WriteLine( “Usage: FileCopy [SourceFile] [DestinationFile]”); return; } string sourceFile = args[0]; string destFile = args[1]; const int BufferSize = 16384; byte[] buffer = new byte[BufferSize]; int bytesCopied = 0; UInt64 totalBytes = 0; //open both files--the source file can be read shared, but not //the destination using (FileStream inStream = File.Open( sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read)) using (FileStream outStream = File.Open( destFile, FileMode.Create, FileAccess.Write, FileShare.None)) { do { //must track how many bytes we actually read in bytesCopied = inStream.Read(buffer, 0, BufferSize); if (bytesCopied > 0) { outStream.Write(buffer, 0, bytesCopied); totalBytes += (UInt64)bytesCopied; } } while (bytesCopied > 0); } Console.WriteLine(“{0:N0} bytes copied”, totalBytes); } }

Conclusion:
Hope this helps,
Happy Coding.