如何用C#邮件发送图片和html格式文件（在正文中非是附件）
只会发文本邮件，不知道如何在正文中实现发html格式的和图片。谁能教教我吗？
下面是发文本格式邮件的代码：
string smtpServer = "smtp.163.com";
MailMessage message = null;
MailAddress from = new MailAddress("发送邮箱地址");
MailAddress to = new MailAddress("接收邮箱地址");
message = new MailMessage(from, to);
message.Subject = "邮件标题";
message.Body ="邮件内容";
SmtpClient client = new SmtpClient(smtpServer, 25);
client.Credentials = new System.Net.NetworkCredential("发送邮箱地址"， "密码");
client.Send(message);

怎么改呢？
[解决办法]

  string smtpServer = "";
        MailMessage message = null;
        MailAddress from = new MailAddress("413294344@qq.com");
        MailAddress to = new MailAddress("413294344@qq.com");
        message = new MailMessage(from, to);
        message.Subject = "邮件标题";
        System.Net.Mail.Attachment attachment = new System.Net.Mail.Attachment(@"C:\Users\Administrator\Desktop\fin_bg2.png");
        message.Attachments.Add(attachment);
        message.IsBodyHtml = true;
        message.Body += "<img src=\"cid:" + attachment.ContentId + "\"/>";
        SmtpClient client = new SmtpClient(smtpServer, 25);
        client.Credentials = new System.Net.NetworkCredential("","");
        client.Send(message);

[解决办法]
html内容可以从模板（比如写到xxx.html文件）中读取，这样比拼接字符串来的好的多的多，万一你后期要修改得多麻烦
------解决方案--------------------

把html文件中的内容读取出来发送，然后里面的图片用远程的url地址。