public static void addUsertoDB(dbClasses obj)
        {
            using (var conn = new SQLiteConnection(dbname))
            {
                using (var statement = conn.Prepare(@" insert into Users
                                                    (first_name,last_name,email_id)
                                                     values(?,?,?);                                                    
                                                    "))
                {
                    statement.Bind(1, obj.first_name);
                    statement.Bind(2, obj.last_name);
                    statement.Bind(3, obj.email_id);

                    statement.Step();
                }
            }
        }
 private void btAddUser_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         dbClasses obj = new dbClasses
         {
             first_name = txbFirstName.Text,
             last_name  = txbSecondName.Text,
             email_id   = txbEmailid.Text
         };
         dbHelperClass.addUsertoDB(obj);
         UtilityClass.MessageDialog("Let's get started", string.Format("Welcome {0}", obj.first_name));
         UtilityData.objCurrentUser = obj;
         this.Frame.Navigate(typeof(pgCourses));
     }
     catch (Exception)
     {
     }
 }