gistfile1.cs

var message = new MailMessage();
    
message.To.Add("user@example.com");
message.To.Add("user2@example.com");
    
message.From = new MailAddress("test@example.com");
message.Subject = "Test";
message.Body = "Test";
    
var client = new SmtpClient("localhost", 25);
client.Send(message);

// also you need to add this to your web.config, obviously you need to add your smtp information here, 
// ask your sysadmin for it.

  <system.net>
    <mailSettings>
      <smtp deliveryMethod="Network" from="no-reply@xxxxxx.com">
        <network host="xxx.xxx.xxx.xxx" port="25" defaultCredentials="true"/>
      </smtp>
    </mailSettings>
  </system.net>
  
// if you can't send emails, then maybe is your local smtp doesnt work.. try with your gmail account

 <system.net>
    <mailSettings>
      <smtp from="yourMailId@gmail.com ">
        <network host="smtp.gmail.com" defaultCredentials="false"
      port="587" userName ="yourmail@gmail.com" password="yourpassword" />
      </smtp>
    </mailSettings>
   </system.net>