private void ImportFromSqlToPdf(object sender, EventArgs e)
 {
     try
     {
         TravelAgencyDbContext dbContext    = new TravelAgencyDbContext();
         PdfGenerator          pdfGenerator = new PdfGenerator();
         pdfGenerator.GeneratePdfReports(dbContext);
         MessageBox.Show("PDF report  was successfully generated with the data from SQL!");
     }
     catch (Exception)
     {
         MessageBox.Show("PDF report couldn't be generated!");
     }
 }