//Add ny item til liste
        public void AddNew()
        {
            //Test på værdier
            if (!String.IsNullOrWhiteSpace(NewGrocItem.grocItem) && !String.IsNullOrWhiteSpace(NewGrocItem.itemQnty))
            {
                if (NewGrocItem.itemQnty.All(Char.IsDigit))
                {
                    //Instancer et container objekt
                    OutputToUser = String.Empty;
                    GrocItem tempGrocItem = new GrocItem();
                    tempGrocItem.grocItem = NewGrocItem.grocItem;
                    tempGrocItem.itemQnty = NewGrocItem.itemQnty;

                    //Add til list
                    GrocList.Add(tempGrocItem);
                }
                else
                {
                    OutputToUser = "******";
                }
            }
            else
            {
                OutputToUser = "******";
            }
        }
 //Til at clear list
 public void Clear()
 {
     if (GrocList.Count > 0)
     {
         GrocList.Clear();
         OutputToUser = String.Empty;
     }
     else
     {
         OutputToUser = "******";
     }
 }
        //Metode til at gemme i fil - Json format!
        private async void SaveList_Async()
        {
            if (GrocList.Count > 0)
            {
                OutputToUser = String.Empty;
                StorageFile localFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);

                await FileIO.WriteTextAsync(localFile, GrocList.GetJson());
            }
            else
            {
                OutputToUser = "******";
            }
        }
 //Remove item fra liste
 public void Remove()
 {
     if (GrocList.Count == 0)
     {
         OutputToUser = "******";
     }
     else
     {
         if (SelectedGrocItem != null)
         {
             OutputToUser = String.Empty;
             GrocList.Remove(SelectedGrocItem);
         }
         else
         {
             OutputToUser = "******";
         }
     }
 }