private void buttonDecrypte_Click(object sender, EventArgs e)
        {
            try
            {
                EncryptionRSA  rsa = new EncryptionRSA();
                TypeConversion tp  = new TypeConversion();

                richTextBoxDecryption.Text = tp.IntToChar(rsa.Dencryptor(richTextBoxDecryption.Text, textBoxPrivateKey.Text));
            }
            catch (Exception ex)
            {
                MessageBox.Show("System Can not Decrypte your Message \n\nExplanation:\nPlease enter Correct Private Key and Correct Encrypted text\n\nException:" + ex.Message + "\n\nPress OK to Proceede");
            }
        }