How to Convert Hex Decoded Strings to Normal Strings in C#?

Hexadecimal encoding is a way of representing binary data in a human-readable format. Each byte of data is represented by two hexadecimal characters. For example, the ASCII character 'A' is represented by the hex value '41'. To convert a hex-encoded string back to its normal representation, we need to decode each pair of hex characters into their corresponding ASCII characters.

C# program that performs the conversion:

using System;
using System.Text;

class HexDecoder
{
    static void Main()
    {
        string hexEncodedString = "48656C6C6F2C20576F726C64"; // Hex-encoded string to be decoded

        string decodedString = HexToString(hexEncodedString);

        Console.WriteLine("Hex Encoded String: " + hexEncodedString);
        Console.WriteLine("Decoded String: " + decodedString);
    }

    static string HexToString(string hex)
    {
        StringBuilder stringBuilder = new StringBuilder(hex.Length / 2);

        for (int i = 0; i < hex.Length; i += 2)
        {
            string hexPair = hex.Substring(i, 2);
            byte byteValue = byte.Parse(hexPair, System.Globalization.NumberStyles.HexNumber);
            stringBuilder.Append((char)byteValue);
        }

        return stringBuilder.ToString();
    }
}

Output:

Hex Encoded String: 48656C6C6F2C20576F726C64
Decoded String: Hello, World

• The HexDecoder class contains a Main method where a hex-encoded string is defined.
• The HexToString method takes a hex-encoded string as input and iterates through pairs of hex characters, converting them to bytes and then to characters.
• The decoded string is printed to the console along with the original hex-encoded string.