public string SaveManager(StockIn stockIn) { if (stockIn.StockQuantity == 0) { return("Stock Quantity should be filled"); } else if (stockInGateway.IsStockExist(stockIn)) { int stockQuantityAvailable = stockInGateway.StockQuantityAvailable(stockIn); stockIn.StockQuantity = stockIn.StockQuantity + stockQuantityAvailable; int row = stockInGateway.Update(stockIn); if (row > 0) { return("Save Successful !"); } else { return("Saving Failed !"); } } else { int row = stockInGateway.SaveGateway(stockIn); if (row > 0) { return("Save Successful !"); } else { return("Saving Failed !"); } } }