Below is the source code that will send email in Chinese or other character than English.

using System.Net.Mail;

MailMessage oMsg = new MailMessage();
oMsg.From = new MailAddress(�Email�, “Name�);
oMsg.To.Add(new MailAddress(�Email�,�Name�));
oMsg.Subject = “subject�;
oMsg.Body = “Chinese character�;
oMsg.BodyEncoding = System.Text.Encoding.GetEncoding( “utf-8″ );
SmtpClient c = new SmtpClient(�SMTP�);
c.Send(oMsg);

You can find more character set recognition at Microsoft page here.

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Send email with attachment c# source code