sending mail completly

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C#

ASP.NET

I am facing a problem and I am not able to understand, please help me.

I am writing a Sending Mail code but I am not able send a mail.
I don't know where is the problem

// Create a Mail Address Type Object for From Email
                 MailAddress sFrom = new MailAddress("xyz@mail.yahoo.com", "New Message");

               // Create a Mail Address Type Object for To Email
                MailAddress sTo = new MailAddress("abc@cherisys.com");

                // Create a Mail Message Type Object for Email and assign values to various properties, like subject, body, mail type.
                MailMessage MyMail = new MailMessage(sFrom, sTo);
                MyMail.Subject = "Subject Text";
                MyMail.Body = "Body Text";
                MyMail.IsBodyHtml = true;
                MyMail.BodyEncoding = Encoding.UTF8;

                //Create a SMTP client type object, Protocol responsible to send emails. And add the address of your email SMTP. Example of Yahoo added.

                SmtpClient SmtpMail = new SmtpClient("smtp.mail.yahoo.com");
                SmtpMail.EnableSsl = true;

                // Decline default credentials and add yours. Your Email (From Email) & Password.
                SmtpMail.UseDefaultCredentials = false;
                SmtpMail.Credentials = new System.Net.NetworkCredential("xyz@mail.yahoo.com", "xyzpassword");
    
                // Now send email
                try
                {
                    SmtpMail.Send(MyMail);
                }
                catch (Exception o) { }