public async Task<IHttpActionResult> AddInvitationToProject(invitations invitations, int projectId)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest();
            }
            invitations.Project_FK = projectId;
            invitations.urlcode = RandomString(20);
            db.invitations.Add(invitations);
            await db.SaveChangesAsync();

            sendMail(invitations);

            return Ok(invitations);
        }
        public async Task<HttpResponseMessage> Postinvitations(invitations[] invitations, int projectId)
        {
            List<invitations> creationFailedInvitations = new List<invitations>();
            foreach (invitations invitation in invitations)
            {
                if (_repo.checkForAvailableEmail(invitation.email))
                    creationFailedInvitations.Add(invitation);
                else {
                    invitation.Project_FK = projectId;
                    invitation.urlcode = RandomString(20);
                    sendMail(invitation);
                    db.invitations.Add(invitation);
                }
            }
            await db.SaveChangesAsync();

            return Request.CreateResponse(HttpStatusCode.BadRequest, creationFailedInvitations);
        }
        private void sendMail(invitations inv)
        {
            MailMessage mailMessage = new MailMessage("*****@*****.**", "*****@*****.**");

            mailMessage.Subject = "Yout got invited to Pdmsys! Check it out!";
            mailMessage.Body = "<body> Hello " + inv.firstname + " " + inv.lastname + "," +
                "<br> You have been invited to a project on Pdmsys, register yourself <a href = 'http://localhost:8080/pdmsys/#/invitation/'"+ inv.urlcode +">" +
            "here </a> and check your project out. If the link is not working, please copy http://localhost:8080/pdmsys/#/invitation/"+ inv.urlcode+" manually into your browser." +
            "<br>Kind Regards<br>Pdmsys - Admin</body>";

            mailMessage.IsBodyHtml = true;

            SmtpClient smtpClient = new SmtpClient("smtp.mailgun.com", 587);

            smtpClient.Credentials = new System.Net.NetworkCredential()
            {
                UserName = "******",
                Password = "******"
            };

            smtpClient.Send(mailMessage);
        }