C# - How to Read Byte Buffer from a File?

Learn, how to read all bytes (byte buffer) from a file using C# program?
Submitted by IncludeHelp, on November 08, 2017 [Last updated : March 26, 2023]

Given a file and we have to read it's all bytes (byte buffer) using C# program.


This is a method of "File" class, it is used to read all bytes from the given file.


Byte[] ReadAllBytes(string filename);


  1. filename - name of the file.

Return Value

This method return array of bytes, in which every element of array contains a byte.

C# program to read byte buffer from a file

using System;
using System.IO;

namespace ConsoleApplication1 {
  class Program {
    static void Main() {
      byte[] byteBuff;

      byteBuff = File.ReadAllBytes("Sample.txt");

      Console.WriteLine("Data of file Sample.txt :");
      for (int i = 0; i < byteBuff.Length; i++) {
        Console.Write(byteBuff[i] + " ");


Data of file Sample.txt :
1 2 3 4 5


In the above program, we need to remember, when we use "File" class, System.IO namespace must be included in the program.

C# File Handling Programs »

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