String mail;
mail = mailtxt.Text;
MailMessagemsg =newMailMessage();
msg.From =newMailAddress("kalaime2790@hotmail.com");
msg.To.Add(newMailAddress(mail));
msg.Subject = "key for joining to the Group";
msg.Body =
"Here i send you the primary key, use this key to generate your own sign and this key will be use for decryption of file";
SmtpClientclient =newSmtpClient("www.gmail.com");
client.Send(msg);