private void btn_encrypt_Click(object sender, EventArgs e) { string plainText = tb_plainText.Text.Trim(); if (plainText != "") { writeLog("Converting " + plainText + " to byte..."); byte[] data = Encoding.UTF8.GetBytes(plainText); byte[] encrypted = rsa.Encrypt(data); writeLog("Using the public key to encrypt your text"); tb_cipherText.Text = Convert.ToBase64String(encrypted); writeLog("-------------- The encryption is compeleted! --------------"); } else { AlertError("Nothing to encrypt."); } }