How to Encode and Decode String With Base64 in C#

using System;
 
namespace Program
{
    public class Program
    {
        //Encode Plain Text To Base64 String
        public static string ToBase64Encode(string text)
        {
            if (String.IsNullOrEmpty(text))
            {
                return text;
            }
 
            byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(text);
            return Convert.ToBase64String(textBytes);
        }
 
        //Decode Plain Text From Base64 String
        public static string ToBase64Decode(string base64EncodedText)
        {
            if (String.IsNullOrEmpty(base64EncodedText))
            {
                return base64EncodedText;
            }
 
            byte[] base64EncodedBytes = Convert.FromBase64String(base64EncodedText);
            return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
        }
 
        public static void Main()
        {
            string str = "Hello, TutorialsRack!";
 
            string encodedText = ToBase64Encode(str);
            Console.WriteLine("Base64 Encoded String: " + encodedText);
 
            string decodedText = ToBase64Decode(encodedText);
            Console.WriteLine("Base64 Decoded String: " + decodedText);
 
            Console.ReadLine();
        }
    }
}

Base64 Encoded String: SGVsbG8sIFR1dG9yaWFsc1JhY2sh

Base64 Decoded String: Hello, TutorialsRack!