private void btnSaveChangesProduct_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         using (InventoryDBEntitiesFK ctx = new InventoryDBEntitiesFK())
         {
             Product p = ctx.Products.Find(Convert.ToInt32(lblProductIdEdit.Content));
             p.ProductName  = tbProductNameEdit.Text;
             p.Category     = tbCategoryEdit.Text;
             p.Description  = tbDescriptionEdit.Text;
             p.Price        = Convert.ToDecimal(this.tbPriceEdit.Text);
             p.SCU          = Convert.ToInt32(this.tbSCUEdit.Text);
             p.Quantity     = Convert.ToInt32(this.tbQuantityEdit.Text);
             p.Location     = tbLocationEdit.Text;
             p.SupplierName = tbSupplierEdit.Text;
             ctx.SaveChanges();
             this.Close();
             man.refreshProductsList();
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }