Mail sending from ur gmail in asp application

//from Ur gmail
 SmtpClient mailClient = new SmtpClient("smtp.gmail.com", 587);

        mailClient.EnableSsl = true;

        NetworkCredential cred = new NetworkCredential("Ur mailAddress@gmail.com","password");
//or
  NetworkCredential cred = new NetworkCredential("txtFrom.Text,"password");
        mailClient.Credentials = cred;

        mailClient.Send(txtFrom.Text, txtTo.Text, txtSubject.Text,txtContent.Value);
    
  
        Response.Write("Mail Sent Successfully");


or


Dim message As New MailMessage(yourGmailAddress, recipientAddress)
message.Subject = "blah blah"
message.Body = "blah blah"
Dim smtp As New SmtpClient("smtp.gmail.com", 587)
smtp.EnableSsl = True
smtp.UseDefaultCredentials = False
smtp.Credentials = New NetworkCredential(yourGmailAddress, yourGmailPassword)
smtp.Send(message)