private void SaveExecute()
 {
     if (String.IsNullOrEmpty(Recipe.RecipeName) || String.IsNullOrEmpty(Recipe.Type) || String.IsNullOrEmpty(Recipe.NumberOfPersons.ToString()) ||
         Recipe.NumberOfPersons == 0 || String.IsNullOrEmpty(Recipe.Description))
     {
         MessageBox.Show("Please fill all fields.", "Notification");
     }
     else
     {
         try
         {
             MessageBoxResult result = MessageBox.Show("Are you sure you want to save the recipe?", "Confirmation", MessageBoxButton.YesNo, MessageBoxImage.Question);
             if (result == MessageBoxResult.Yes)
             {
                 //changing id and author of recipe is user is administrator
                 Recipe.Author         = User.NameAndSurname;
                 Recipe.UserId         = User.UserId;
                 Recipe.NameAndSurname = User.NameAndSurname;
                 bool isEdited = recipes.EditRecipe(Recipe);
                 if (isEdited == true)
                 {
                     string message = String.Format("Recipe {0} of user {1} is edited.", recipe.RecipeName, OldAuthor);
                     MessageBox.Show(message, "Notification", MessageBoxButton.OK);
                     if (Recipe.NameAndSurname == "Administrator")
                     {
                         AdminView adminView = new AdminView();
                         editRecipe.Close();
                         adminView.ShowDialog();
                     }
                     else
                     {
                         UserView userView = new UserView(users.FindUser(recipe.UserId));
                         editRecipe.Close();
                         userView.ShowDialog();
                     }
                 }
                 else
                 {
                     MessageBox.Show("Recipe cannot be edited.", "Notification", MessageBoxButton.OK);
                 }
             }
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.ToString());
         }
     }
 }