Converting Hexadecimal to Byte in C#

• 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.
• Bytes: In programming, a byte is a unit of digital information that consists of 8 bits.

C# program to convert Hexadecimal to Byte in C#:

using System;

class Program
{
    static void Main()
    {
        // Define a hexadecimal string
        string hexString = "1B3D5AC";

        // 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") + " ");
        }
        Console.ReadKey();
    }

    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 will define a hexadecimal string "1A2B3C", then will 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). 

Output:

Byte Array:
1A 2B 3C