C # A mail sending class written

Using System;
Using System. ComponentModel;
Using System. Text;
Using System. Net;
Using System. Net. Mail;

Namespace Smtp
{
Public class SmtpMail
{
Private string toAddress = "";
Private string mailUser = "";
Private string userPassword = "";
Private string displayName = "";
Private string mailSubject = "";
Private string sendMessage = "";
Private int mailPort = 0;
Private string mailHost = "";

Public string Message
{
Get
{
Return sendMessage;
}
}

Public SmtpMail (string to_address, string display_name, string mail_subject, string mail_user, string user_password, int mail_port, string mail_host)
{
ToAddress = to_address;
DisplayName = display_name;
MailSubject = mail_subject;
MailUser = mail_user;
UserPassword = user_password;
MailPort = mail_port;
MailHost = mail_host;
}

Public void SendMail (string strBody)
{
System. Net. Mail. MailMessage msg = new System. Net. Mail. MailMessage ();
Msg. To. Add (toAddress );
Msg. From = new MailAddress (mailUser, displayName, System. Text. Encoding. UTF8 );
Msg. Subject = mailSubject;
Msg. SubjectEncoding = System. Text. Encoding. UTF8;
Msg. Body = strBody;
Msg. BodyEncoding = System. Text. Encoding. UTF8;
Msg. IsBodyHtml = false;
Msg. Priority = MailPriority. Normal;

SmtpClient client = new SmtpClient ();
Client. Credentials = new System. Net. NetworkCredential
(MailUser, userPassword );
Client. Port = mailPort;
Client. Host = mailHost;
Client. EnableSsl = false;
Client. SendCompleted + = new SendCompletedEventHandler (client_SendCompleted );
Object userState = msg;
Try
{
Client. SendAsync (msg, userState );
}
Catch (System. Net. Mail. SmtpException ex)
{
SendMessage = ex. ToString ();
}
}

Void client_SendCompleted (object sender, AsyncCompletedEventArgs e)
{
MailMessage mail = (MailMessage) e. UserState;
String subject = mail. Subject;

If (e. Cancelled)
{
String canceled = string. Format ("[{0}] Send canceled.", subject );
SendMessage = canceled;
}
If (e. Error! = Null)
{
String error = String. Format ("[{0}] {1}", subject, e. Error. ToString ());
SendMessage = error;
}
Else
{
SendMessage = "Message has been sent successfully! ";
}
}
}
}