Base64 C# #CSharp

gistfile1.txt

static byte[] AnotherDecode64(string base64Decoded)
    {
        string temp = base64Decoded.TrimEnd('=');
        int asciiChars = temp.Length - temp.Count(c => Char.IsWhiteSpace(c));
        switch (asciiChars % 4)
        {
            case 1:
                //This would always produce an exception!!
                //Regardless what (or what not) you attach to your string!
                //Better would be some kind of throw new Exception()
                return new byte[0];
            case 0:
                asciiChars = 0;
                break;
            case 2:
                asciiChars = 2;
                break;
            case 3:
                asciiChars = 1;
                break;
        }
        temp += new String('=', asciiChars);

        return Convert.FromBase64String(temp);