The specified string is not in the form required for an e-mail

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C#

MVC4

[HttpPost]
       public ActionResult Index(MailModel objModelMail, HttpPostedFileBase fileUploader)
       {
           try
           {
               if (objModelMail.To!=null)
               {
                   Thread email = new Thread(delegate()
                   {
                       string from = "muthujuna@gmail.com"; //example:- sourabh9303@gmail.com
                       using (MailMessage mail = new MailMessage())
                       {
                           string[] ToAddress = { objModelMail.To };
                           mail.From = new MailAddress(from);
                           mail.Subject = objModelMail.Subject;
                           mail.Body = objModelMail.Body;

                           foreach (string address in ToAddress)
                           {
                               mail.To.Add(address);
                           }


                           if (fileUploader != null)
                           {
                               string fileName = Path.GetFileName(fileUploader.FileName);
                               mail.Attachments.Add(new Attachment(fileUploader.InputStream, fileName));
                           }
                           mail.IsBodyHtml = false;
                           SmtpClient smtp = new SmtpClient();
                           smtp.Host = "smtp.gmail.com";
                           smtp.EnableSsl = true;
                           NetworkCredential networkCredential = new NetworkCredential(from, "XXXXXX");
                           smtp.UseDefaultCredentials = true;
                           smtp.Credentials = networkCredential;
                           smtp.Timeout = int.MaxValue;
                           smtp.Port = 587;
                           smtp.Send(mail);
                       }
                   });
                   email.IsBackground = true;
                   email.Start();
                   var To = objModelMail.To;
                   ParsingTemplate(To);
                   ViewBag.Success = "hi, your Mail Send SuccessFully";
               }
               else
               {
                   ViewBag.Error = "Error occured while processing your request";
               }
           }
           catch (Exception e)
           {
               ViewBag.Error = ("Could not send the e-mail - error: " + e.Message);
           }
           return View("Index", objModelMail);//I need that successful message here itself
       }

       private void ParsingTemplate(string To)
       {

           string templateFilePath = System.Web.HttpContext.Current.Server.MapPath("~/EmailTemplate/EmailTemplateTest.html");
           var templateAsString = System.IO.File.ReadAllText(templateFilePath);

           var myViewModel = new TestEmailTemplateViewModel
           {
               UserFullName = "Mohamed Nady",
               UserName = "NADY",
               SiteUrl = "http://www.mohnady.com",
               RegDate = DateTime.Now.ToString()
           };



i AM GETTING ERROR THIS LINE:
           string body = RazorEngine.Engine.Razor.RunCompile(templateAsString, "templateKey", typeof(TestEmailTemplateViewModel), myViewModel);
        

           SendEmail("muthujuna@gmail.com", To, "testEmail", body);


       }

       private void SendEmail(string from, string To, string subject, string body)
       {
           MailMessage mail = new MailMessage();
           mail.To.Add(new MailAddress(To));
           mail.From = new MailAddress(from);
           mail.Subject = subject;
           string Body = body;
           mail.Body = Body;
           mail.IsBodyHtml = true;
           SmtpClient smtp = new SmtpClient();
           smtp.Host = "smtp.gmail.com";
           smtp.Port = 587;
           smtp.UseDefaultCredentials = true;
           smtp.Credentials = new System.Net.NetworkCredential
           ("muthujuna@gmail.com", "XXXXX");// Enter seders User name and password
           smtp.EnableSsl = true;
           smtp.Send(mail);
       }

What I have tried:

hi,

I am Getting Error This line ,
string body = RazorEngine.Engine.Razor.RunCompile(templateAsString, "templateKey", typeof(TestEmailTemplateViewModel), myViewModel);



Actually i am trying to send the mail with one EmailTemplate but one Error has occured what my problem is

1.first mail has send when i enter ToAddress that muthujuna@gmail.com
2.if suppose i enter someother To Address Means am getting an Error which i put it Top
"The specified string is not in the form required for an e-mail"



Please help me if konow this