Probably my problem is verry silly and stupid. How I can convert information from: WindowRegionalMarket?[0]?.MyOrders?.SellOrderView?.Entry?[0]?.ListColumnCellLabel?[2]?.value to Decimal value and do some math, or compare? This entire path provide information about price in ISK .
Problem solved, but in the other way. Information from WindowRegionalMarket?.[0]?.MyOrders?.SellOrderView?.Entry?.[0]LabelText?.FirstOrDefault().Text.ToString() parsed by regex and converted to decimal