C#:

1. public bool Send_Email(string Subject, string Body, string ToEmail, string AttachmentUrl)
2. {
3. bool Sent = false;
4. try
5. {
6. if (!string.IsNullOrEmpty(ToEmail))
7. {
8. string FromEmail = "", Username = "", Password = "", Host = "", Port = "";
9. FromEmail = Convert.ToString(ConfigurationManager.AppSettings["FromEmail"]);
10. Username = Convert.ToString(ConfigurationManager.AppSettings["Username"]);
11. Password = Convert.ToString(ConfigurationManager.AppSettings["Password"]);
12. Host = Convert.ToString(ConfigurationManager.AppSettings["Host"]);
13. Port = Convert.ToString(ConfigurationManager.AppSettings["Port"]);
14. bool UseSsl = Convert.ToBoolean(ConfigurationManager.AppSettings["UseSsl"]);
15. System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
16. System.Net.NetworkCredential cred = new System.Net.NetworkCredential(Username, Password);
17. if (ToEmail.Contains(','))
18. {
19. string[] ToEmailArray = ToEmail.Split(',');
20. foreach (string si in ToEmailArray)
21. {
22.     mail.To.Add(si);
23. }
24. }
25. else
26. {
27. mail.To.Add(ToEmail);
28. }
29. mail.Subject = Subject;
30. mail.From = new System.Net.Mail.MailAddress(FromEmail, Convert.ToString(ConfigurationManager.AppSettings["FromName"]));
31. mail.IsBodyHtml = true;
32. mail.Body = Body;
33. if (!string.IsNullOrEmpty(AttachmentUrl))
34. {
35. System.Net.Mail.Attachment Attachment;
36. if (AttachmentUrl.Contains(','))
37. {
38.     string[] AttachmentUrlArray = ToEmail.Split(',');
39.     foreach (string url in AttachmentUrlArray)
40.     {
41.         string strUrl = Uri.EscapeUriString(url);
42.         if (File.Exists(strUrl))
43.         {
44.             Attachment = new System.Net.Mail.Attachment(strUrl);
45.             mail.Attachments.Add(Attachment);
46.         }
47.     }
48. }
49. else
50. {
51.     string strUrl = Uri.EscapeUriString(AttachmentUrl);
52.     if (File.Exists(strUrl))
53.     {
54.         Attachment = new System.Net.Mail.Attachment(strUrl);
55.         mail.Attachments.Add(Attachment);
56.     }
57. }
58. }
59. System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient();
60. smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
61. smtp.UseDefaultCredentials = false;
62. smtp.EnableSsl = UseSsl;
63. smtp.Credentials = cred;
64. smtp.Host = Host;
65. smtp.Port = Convert.ToInt32(Port);
66. smtp.Send(mail);
67. Sent = true;
68. }
69. }
70. catch
71. {
72. Sent = false;
73. }
74. return Sent;
75. }

Configuration in appSettings.config:

1.  <!-- Email Data Configuration Start -->
2.   <add key="FromName" value="Company Name or Any Text"/>
3.   <add key="FromEmail" value="example@gmail.com"/>
4.   <add key="Username" value="example@gmail.com"/>
5.   <add key="Password" value="password"/>
6.   <add key="Host" value="smtp.gmail.com"/>
7.   <add key="Port" value="587"/>
8.   <add key="UseSsl" value="true"/>
9.   <add key="ToEmail" value="example@gmail.com"/>
10.   <!-- Email Data Configuration End -->