AddClick.cs

private async void Insert_Button_Click(object sender, RoutedEventArgs e)
        {
            //Creating a new data object

            var obj = new Database.Schema.Students
            {
                Name = NameBox.Text,
                Marks = Convert.ToInt32(MarksBox.Text)
            };

            //If database exists
            bool check = await Database.DatabaseHelper.Checkdatabase();
            if (check)
            {
                //Check for null
                if (obj.Name != String.Empty && obj.Marks.ToString() != String.Empty)
                {
                    //Inserting the record
                    Database.DatabaseHelper.AddNewStudent(obj);
                    var mm = new MessageDialog("Record Inserted");
                    await mm.ShowAsync();
                }
                else
                {
                    var mm = new MessageDialog("Invalid Fields");
                    await mm.ShowAsync();
                }
            }
        }

hi im new