Send Mail is not working asp.net web forms

Question

Hi,

 

I got an error like this.

 

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

 

Source Error:

tsmtpClient.Send(tmailmessage);

 

private static void SenEmail(string from, string to, string cc, string bcc, string subject, string body, bool IsHTML)

{

//create an instant in mail message

MailMessage tmailmessage = new MailMessage();

//assign sender mail address

tmailmessage.From = new MailAddress(from);

//asssign recipiant email address

tmailmessage.To.Add(new MailAddress(to));

//check if cc/bcc is not null

if (cc != null && cc != "")

tmailmessage.CC.Add(new MailAddress(cc));

if (bcc != null && bcc != "")

tmailmessage.Bcc.Add(new MailAddress(bcc));

//assign the subject

tmailmessage.Subject = subject;

//assign the mail body

tmailmessage.Body = body;

//assign the format into mail box

tmailmessage.IsBodyHtml = IsHTML;

//assign the prority of the mail into normal

tmailmessage.Priority = MailPriority.Normal;

//subject encoding by UTF-8

tmailmessage.SubjectEncoding = System.Text.Encoding.UTF8;

//body encoding by UTF-8

tmailmessage.BodyEncoding = System.Text.Encoding.UTF8;

//Create a new instance of SMTP client and pass name port number from SMTP gmail server

SmtpClient tsmtpClient = new SmtpClient("smtp.gmail.com", 587);

//enable SSL of theamtp client

tsmtpClient.EnableSsl = true;

//use delivery method as network

tsmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;

//use the Credentials set to false

tsmtpClient.UseDefaultCredentials = false;

//pass account information to the sender

tsmtpClient.Credentials = new System.Net.NetworkCredential("Email", "Password");

tsmtpClient.Send(tmailmessage);

}