How to send mail using c#.net?

using System.Web;
using System.Net.Mail;
using System.Net;



MailMessage mail = new MailMessage();
SmtpClient smtp = new SmtpClient();
mail.Body = "Error Message Goes here";
mail.IsBodyHtml = true;
mail.From = new MailAddress("mohana@kagtech.org", "SRP Client");
mail.Subject = "Error On UpLoading Data";
mail.To.Add("kannabiran.b@kagtech.org");
mail.Priority = MailPriority.High;

smtp.Host = "smtp.kanna.net";
smtp.Port = 25;
smtp.Send(mail);