Sending e-mail through proxy setting

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C#

Hi,

I am developing an application in which I have to send e-mail.
I am able to send e-mail when I have direct internet connection, but I am provided with proxy in my LAN.
Though I have to send email.

Please help me in send mail via proxy server.

Note:
I use c#.net.

Here is a piece of code that I use:

    string msgSubject = txtSubject.Text.Trim();
    string FrommailId = txtFrom.Text.ToString();
    string TomailId = txtTo.Text.ToString();
    string mailPassword = "password";
    string mailServer = txtMailServer.Text.Trim();
    System.Net.Mail.MailMessage objMessage = new MailMessage();
    objMessage.To.Add(TomailId);//Set To address
    objMessage.From = new MailAddress(FrommailId, "From", System.Text.Encoding.UTF8);//Set  From address
    objMessage.Subject = msgSubject;//Set Subject
    objMessage.SubjectEncoding = System.Text.Encoding.UTF8;
    objMessage.Body = txtMessage.Text.Trim();
    objMessage.BodyEncoding = System.Text.Encoding.UTF8;
    objMessage.IsBodyHtml = false;
    objMessage.Priority = MailPriority.High;

    SmtpClient client = new SmtpClient();
    client.Credentials = new System.Net.NetworkCredential(FrommailId, mailPassword);//Set UserName and Password for Network authendication
    client.Port = Convert.ToInt32(txtPortNo.Text.Trim());//Port for sending mail
    client.Host = mailServer;//587 For smtp.gmail.com
    client.EnableSsl = true;

client.Send(objMessage);

[edit]Code block added, "Ignore HTML..." option disabled - OriginalGriff[/edit]