GettingError while sending mail using C# code on Server

Question

i am getting an error Request for the permission of type 'System.Net.Mail.SmtpPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

 

on shared hosting server but it worked fine on localhost

here is my code

 

using (MailMessage mail = new MailMessage())

{

mail.From = new MailAddress(emailFrom);

mail.To.Add(emailTo);

mail.Subject = subject;

mail.Body = body;

mail.IsBodyHtml = false;

message.Text = "Loading...";

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

smtp.DeliveryMethod = SmtpDeliveryMethod.Network;

smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");

smtp.EnableSsl = true;

//smtp.UseDefaultCredentials = false;

smtp.Send(mail);

message.Text = "Message sent successfully....";

txtEmail.Text = "";

txtmsg.Text = "";

txtName.Text = "";

success.Visible = true;