public void Send(MailMessage message)
{
if (this.InCall)
{
throw new InvalidOperationException(Resources.SmtpClientInAsyncCall);
}
if (message == null)
{
throw new ArgumentNullException("message", Resources.SmtpClientMessageNull);
}
if (this.DeliveryMethod == SmtpDeliveryMethod.Network)
{
this.CheckHostAndPort();
}
MailAddressCollection recipients = new MailAddressCollection();
if (message.From == null)
{
throw new InvalidOperationException(SR.GetString("SmtpFromRequired"));
}
if (message.To != null)
{
foreach (MailAddress address in message.To)
{
recipients.Add(address);
}
}
if (message.Bcc != null)
{
foreach (MailAddress address2 in message.Bcc)
{
recipients.Add(address2);
}
}
if (message.CC != null)
{
foreach (MailAddress address3 in message.CC)
{
recipients.Add(address3);
}
}
if (recipients.Count == 0)
{
throw new InvalidOperationException(SR.GetString("SmtpRecipientRequired"));
}
try
{
this.InCall = true;
SendInternal(message);
}
catch (Exception exception)
{
throw new SmtpException(SR.GetString("SmtpSendMailFailure"), exception);
}
finally
{
this.InCall = false;
}
}