Email Sending Error ..

Question

 

Hi ,

 

   I had a issue while i develop the Email sending , i Am facing the problem..in the below code Kindly Help me out .

 

Code sample :  

 

protected void SendEmail(object sender, EventArgs e)

{

string to = txtTo.Text;

string from = txtEmail.Text;

string subject = txtSubject.Text;

string body = txtBody.Text;

using (MailMessage mm = new MailMessage(txtEmail.Text, txtTo.Text))

{

mm.Subject = txtSubject.Text;

mm.Body = txtBody.Text;

if (fuAttachment.HasFile)

{

string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);

mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));

}

mm.IsBodyHtml = false;

SmtpClient smtp = new SmtpClient();

smtp.Host = "Smtp.gmail.com";

smtp.EnableSsl = true;

NetworkCredential NetworkCred = new NetworkCredential(txtEmail.Text, txtPassword.Text);

smtp.UseDefaultCredentials = true;

smtp.Credentials = NetworkCred;

smtp.Port = 587;

smtp.Send(mm);    In this like Error is occured 

ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);

}

}

 

Error :

 

 

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

 

If possible , Guid me properly , with the appropriate change . 

 

 

Thanks in advance