private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            ModelHoliday        db    = new ModelHoliday();
            tbl_ApplicationData myApp = new tbl_ApplicationData();

            myApp.ApplicationDescription = Application_description.Text;
            myApp.ApplyingDate           = Applying_date.SelectedDate;
            if (Ending_date.SelectedDate != null)
            {
                myApp.EndingDate = (DateTime)Ending_date.SelectedDate;
            }
            if (Starting_date != null)
            {
                myApp.StartingDate = (DateTime)Starting_date.SelectedDate;
            }
            myApp.UserName     = User_name.Text;
            myApp.LeavePurpose = Leave_purpose.Text;
            myApp.LeaveTypeId  = Convert.ToInt32(Leave_type_id.Text);
            myApp.NoOfDays     = Convert.ToInt32(numbers_of_days.Text);

            db.tbl_ApplicationData.Add(myApp);
            db.SaveChanges();
            MainWindow.cframe.Source = new Uri(@"Pages/AdminHomePage.xaml", UriKind.RelativeOrAbsolute);
        }