Sending Email using smtp in c#

 Hi,
I am facing a problem with sending mail from a web form. The form does two actions; it inserts data into two separate tables in a database and sends the form field information as an email to the
administrator. I debugged the code and there are no errors in it, but when I submit the form it says" Exception occurred failure sending email".
 
Can someone help me please 
 
using System;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using Sy ...