How do I encode and decode a base64 string?

Question

1. How do I return a base64 encoded string given a string?

2. How do I decode a base64 encoded string into a string?

Answer 1

    using System;
    using System.Text;

    public static class Base64Conversions
    {
        public static string EncodeBase64(this string text, Encoding encoding = null)
        { 
            if (text == null) return null;

            encoding = encoding ?? Encoding.UTF8;
            var bytes = encoding.GetBytes(text);
            return Convert.ToBase64String(bytes);
        }

        public static string DecodeBase64(this string encodedText, Encoding encoding = null)
        {
            if (encodedText == null) return null;

            encoding = encoding ?? Encoding.UTF8;
            var bytes = Convert.FromBase64String(encodedText);
            return encoding.GetString(bytes);
        }
    }

Usage

    var text = "Sample Text";
    var base64 = text.EncodeBase64();
    base64 = text.EncodeBase64(Encoding.UTF8); //or with Encoding