Mohanapriya R Mohanapriya R
Updated date Feb 15, 2024
In this article, we will learn how to convert hexadecimal values to bytes in C#. This article provides clear explanations and code examples to help you grasp the concept easily.

Converting Hexadecimal to Byte in C#

Hexadecimal numbers are often encountered in programming, especially when dealing with binary data or low-level operations. In C#, converting hexadecimal values to bytes is a common task that can be achieved using built-in functions and libraries. In this article, we will explore how to perform this conversion efficiently.

Before diving into the code, let's briefly understand what hexadecimal and bytes are:

  • Hexadecimal: Hexadecimal is a base-16 numbering system that uses sixteen distinct symbols, typically the digits 0–9 and the letters A–F, to represent numbers. It is commonly used in computing to express binary numbers in a more human-readable format.

  • Bytes: In programming, a byte is a unit of digital information that consists of 8 bits. It is commonly used to represent characters, numbers, and other data types.

Now, let's see how we can convert hexadecimal values to bytes in C#:

using System;

class Program
    static void Main()
        // Define a hexadecimal string
        string hexString = "1A2B3C";

        // Convert the hexadecimal string to a byte array
        byte[] byteArray = StringToByteArray(hexString);

        // Output the byte array
        Console.WriteLine("Byte Array:");
        foreach (byte b in byteArray)
            Console.Write(b.ToString("X2") + " ");

    static byte[] StringToByteArray(string hex)
        int length = hex.Length;
        byte[] bytes = new byte[length / 2];

        for (int i = 0; i < length; i += 2)
            bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);

        return bytes;
  • We define a hexadecimal string "1A2B3C".
  • We use the StringToByteArray method to convert the hexadecimal string to a byte array.
  • The StringToByteArray method iterates over the hexadecimal string, converting pairs of characters into bytes using the Convert.ToByte method with base 16 (hexadecimal).
  • Finally, we output the byte array in hexadecimal format.


Byte Array:
1A 2B 3C

This program successfully converts the hexadecimal string "1A2B3C" into a byte array [0x1A, 0x2B, 0x3C].

In conclusion, converting hexadecimal values to bytes in C# is a straightforward process that can be accomplished using built-in functions and libraries. Understanding this conversion is essential for handling binary data and performing low-level operations in C# programming.

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