private void Add_Clicked(object sender, EventArgs e)
 {
     if (!HideSeries.IsVisible)
     {
         if (String.IsNullOrEmpty(Title.Text))
         {
             DisplayAlert("Empty field", "Please enter a title", "OK");
         }
         else if (String.IsNullOrEmpty(Year.Text))
         {
             DisplayAlert("Empty field", "Please enter a year", "OK");
         }
         else
         {
             databaseManager.AddMovie(Title.Text, Description.Text, int.Parse(Year.Text));
         }
     }
     if (HideSeries.IsVisible)
     {
         if (String.IsNullOrEmpty(Title.Text))
         {
             DisplayAlert("Empty field", "Please enter a title", "OK");
         }
         else if (String.IsNullOrEmpty(Year.Text))
         {
             DisplayAlert("Empty field", "Please enter a year", "OK");
         }
         else if (String.IsNullOrEmpty(YearEnded.Text))
         {
             YearEnded.Text = "-1";
         }
         else if (String.IsNullOrEmpty(NumberOfEpisodes.Text))
         {
             DisplayAlert("Empty field", "Please enter the number of episodes", "OK");
         }
         else if (String.IsNullOrEmpty(NumberOfSeasons.Text))
         {
             DisplayAlert("Empty field", "Please enter the number of seasons", "OK");
         }
         else
         {
             databaseManager.AddSerie(Title.Text, Description.Text, int.Parse(Year.Text), int.Parse(YearEnded.Text), int.Parse(NumberOfEpisodes.Text), int.Parse(NumberOfSeasons.Text));
         }
     }
 }