void Decrypt(object obj)
        {
            if (rsaxml is null)
            {
                rsaxml = new RSAXML();
            }

            ShowKey(obj);

            CipherBytes = "Done";

            string temp = File.ReadAllText(FileChoice);

            byte[] toDecrypt = Convert.FromBase64String(temp);
            byte[] decrypted = rsaxml.Decrypt(toDecrypt);

            PlainText = Encoding.ASCII.GetString(decrypted);
        }