ASP.NET，C＃如何编写这个sql命令

Question

如何在asp.net c＃代码后面编写这段代码？

我要做的是选择invoicetable中orderno的所有行，其中session等于当前inventorytable，并从中删除SqlCommand cmd = new SqlCommand("UPDATE inventorytable JOIN invoicetable ON inventorytable.ItemID = invoicetable.ItemID SET inventorytable.inventory = inventorytable.inventory-invoice.QTY WHERE invoicetable.No='" + Convert.ToInt32(Session["invoiceno"]) + "'" , con); InsertUpdateData(cmd); 的库存。与itemid的匹配的invoicetable数量。

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