private void FillFormWithItem(Item item)
        {
            lblId.Content        = item.Id;
            lblCategory.Content  = item.Category.Name;
            txtName.Text         = item.Name;
            txtDescribe.Text     = item.Description;
            lblStartDate.Content = item.StartDate;
            lblEndDate.Content   = item.EndDate;
            lblSeller.Content    = item.SellerUser.UserName;
            chkSold.IsChecked    = item.State > 0;

            lvBids.DataContext = itemService.GetAllBidsByItem(item.Id);
        }