private void rbCompanyName_Click(object sender, RoutedEventArgs e)
 {
     if (rbCompanyName.IsChecked.HasValue && rbCompanyName.IsChecked.Value)
     {
         sortCriteria = JobSearchEnum.SortingCriteria.Company;
     }
 }
 private void rbPostedDate_Click(object sender, RoutedEventArgs e)
 {
     if (rbPostedDate.IsChecked.HasValue && rbPostedDate.IsChecked.Value)
     {
         sortCriteria = JobSearchEnum.SortingCriteria.Date;
     }
 }
 private void rbPayHigh_Click(object sender, RoutedEventArgs e)
 {
     if (rbPayHigh.IsChecked.HasValue && rbPayHigh.IsChecked.Value)
     {
         sortCriteria = JobSearchEnum.SortingCriteria.PayHigh;
     }
 }