problem ved afsendelse af mail..

System.Security.SecurityException: Request for the permission of type 'System.Net.Mail.SmtpPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Line 43:    {
Line 44:       
Line 45:        SmtpClient sc = new SmtpClient("smtp.gmail.com", 587);
Line 46:        //to authenticate we set the username and password properites on the SmtpClient
Line 47:        sc.EnableSsl = true;



Jeg får denne fejl ved afsendelse af mail. Det virker fint lokalt men ikke efter jeg uploader. Nogen der kan hjælpe?


SmtpClient sc = new SmtpClient("smtp.gmail.com", 587);
        //to authenticate we set the username and password properites on the SmtpClient
        sc.EnableSsl = true;
        sc.DeliveryMethod = SmtpDeliveryMethod.Network;
        sc.Credentials = new NetworkCredential("brugernavn", "kodeord");
                   
        StringBuilder sb = new StringBuilder();
        MailMessage msg = null;

       
        sb.Append("***. " + "\n\n");

       

       

        sb.Append("Navn: " + txtName.Text + "\n");
        sb.Append("Mail: " + txtMail.Text + "\n");
        sb.Append("tlf.nr.  : " + txtPhone.Text + "\n\n");

        if (RadioButton1.Checked == true)
            sb.Append("****?  : " + RadioButton1.Text + "\n");
        if (RadioButton2.Checked == true)
            sb.Append("*****?  : " + RadioButton2.Text + "\n\n");


      ;

        try
        {
            msg = new MailMessage(txtMail.Text, "mail@hotmail.com", "support@support.com", sb.ToString());

            sc.Send(msg);


           

            txtName.Text = "";
            txtPhone.Text = "";
            txtMail.Text = "";

            Response.Redirect("MailRecieved.aspx");
        }
        catch (Exception err)
        {

            // something bad happened
            Response.Write(err.Message);

        }
        finally
        {

            if (msg != null)
            {
                msg.Dispose();
            }

        }