how to send email in recepient with semicolon

protected static string mailSend(string FromAddress,string password,string[] ToAddress,string[] CcAddress,string[] BccAddress,string MessageBody,string Subject,string[] FileAttachment) 
        {
            try
            {
                MailMessage obj = new MailMessage();
                SmtpClient serverobj = new SmtpClient();

                serverobj.Credentials = new NetworkCredential(FromAddress, Password);
                serverobj.Port = 25;
                serverobj.Host = "smtp.gmail.com";
                serverobj.EnableSsl = true;
                obj = new MailMessage();
                obj.From = new MailAddress(FromAddress, FromAddress, System.Text.Encoding.UTF8);
                obj.Priority = MailPriority.High;
                obj.Subject = Subject.Trim();
                string date = DateTime.Now.ToString();
                obj.Body = MessageBody;
                obj.IsBodyHtml = true;


                if (ToAddress != null)
                {
                    foreach (string toAddr in ToAddress)
                        obj.To.Add(new MailAddress(toAddr));
                }



                if (CcAddress != null)
                {
                    foreach (string ccAddr in CcAddress)
                        obj.CC.Add(new MailAddress(ccAddr));
                }
                else
                    CcAddress = null;



                if (BccAddress != null)
                {
                    foreach (string bccAddr in BccAddress)
                        obj.Bcc.Add(new MailAddress(bccAddr));
                }
                else
                    BccAddress = null;


                if (Subject == string.Empty)
                    Subject = string.Empty;

                if (MessageBody == string.Empty)
                    MessageBody = string.Empty;


                if (Attachments != null && Attachments.Length > 0)
                    foreach (string _Attachment in Attachments)
                        obj.Attachments.Add(new System.Net.Mail.Attachment(_Attachment));
                else
                    Attachments = null;



                dbquery.InsertMail(FromAddress, ToAddress, CcAddress, BccAddress, Subject, MessageBody, Attachments);
                serverobj.Send(obj);
                return "Mail Sent Successfully";
            }

            catch (Exception ex)
            {
                return ex.Message;
            }
        }