private void txt_Serial_TextChanged(object sender, TextChangedEventArgs e)
 {
     connect = new CTUConnection();              // refreshens the 'CTUConnection' class //
     connect.SelectNewVehicle();                 //*Selects the specified columns in the Patient table*//
     connect.SearchNewSerialNO(txt_Serial.Text); //Searches the customer's 'name' within the populated table//
     DGV_NewCars.ItemsSource = connect.dataset;  //*All the selected fields are filtered inside the table and stored inside the grid-view*//
 }