Send Email with multiple CC address in ASP.Net using C#

You need to use MailMessage.CC propertyfor adding cc address.

Check the below code. Here i have used comma separated address for multiple cc address.

You need to change as per your cc address format.

string ccAddresses = "test1@gmail.com,test1@gmail.com";
using (StringWriter sw = new StringWriter())
{
    using (HtmlTextWriter hw = new HtmlTextWriter(sw))
    {
        GVBBSTK.RenderControl(hw);
        StringReader sr = new StringReader(sw.ToString());

        MailMessage mm = new MailMessage("akhterhussain80@gmail.com", "akhterhussain80@gmail.com");
        for (int i = 0; i < ccAddresses.Split(',').Length; i++)
        {
            mm.CC.Add(new MailAddress(ccAddresses.Split(',')[i]));
        }
        mm.Subject = "Silver Rags Stock";
        mm.Body = "Sir, Below attached Stock:<hr />" + sw.ToString(); ;
        mm.IsBodyHtml = true;
        SmtpClient smtp = new SmtpClient();
        smtp.Host = "mail.xyz.com";
        smtp.EnableSsl = true;
        NetworkCredential NetworkCred = new NetworkCredential();
        NetworkCred.UserName = "akhter@xyz.com";
        NetworkCred.Password = "xxxxx";
        smtp.UseDefaultCredentials = false;
        smtp.EnableSsl = false;
        smtp.Credentials = NetworkCred;
        smtp.Port = 587;
        smtp.Send(mm);
    }
}