Formview Editing Items in .cs File

[mad@Max]

My formview datasource is a database table named "properties". \[code\]CREATE TABLE [dbo].[properties] ([property_id] INT IDENTITY (1, 1) NOT NULL,[property_type_code] INT NOT NULL,[city_id] INT NULL,[date_on_market] DATETIME NULL,[property_name] CHAR (25) NULL,[property_owner] CHAR (25) NULL,[property_description] CHAR (100) NULL,[property_address] CHAR (50) NULL,[vendor_requested_price] INT NULL,[other_property_details] CHAR (50) NULL,CONSTRAINT [Key7] PRIMARY KEY CLUSTERED ([property_id] ASC),CONSTRAINT [Relationship15] FOREIGN KEY ([property_type_code]) REFERENCES [dbo].[ref_properties_type] ([property_type_code]),CONSTRAINT [Relationship56] FOREIGN KEY ([city_id]) REFERENCES [dbo].[cities] ([city_id]) ON DELETE CASCADE);\[/code\]My Formview is like that : \[code\]`<asp:FormView ID="FormView1" runat="server" DataKeyNames="property_id" DataSourceID="SqlDataSource2" oniteminserted="FormView1_ItemInserted" oniteminserting="FormView1_ItemInserting"> <InsertItemTemplate> property_type_code: <asp:TextBox ID="property_type_codeTextBox" runat="server" Text='<%# Bind("property_type_code") %>' /> <br /> date_on_market: <asp:TextBox ID="date_on_marketTextBox" runat="server" Text='<%# Bind("date_on_market") %>' /> <br /> property_name: <asp:TextBox ID="property_nameTextBox" runat="server" Text='<%# Bind("property_name") %>' /> <br /> property_owner: <asp:TextBox ID="property_ownerTextBox" runat="server" Text='<%# Bind("property_owner") %>' /> <br /> property_description: <asp:TextBox ID="property_descriptionTextBox" runat="server" Text='<%# Bind("property_description") %>' /> <br /> property_address: <asp:TextBox ID="property_addressTextBox" runat="server" Text='<%# Bind("property_address") %>' /> <br /> vendor_requested_price: <asp:TextBox ID="vendor_requested_priceTextBox" runat="server" Text='<%# Bind("vendor_requested_price") %>' /> <br /> other_property_details: <asp:TextBox ID="other_property_detailsTextBox" runat="server" Text='<%# Bind("other_property_details") %>' /> <br /> <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert" /> &nbsp;<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> </InsertItemTemplate> <ItemTemplate> &nbsp; &nbsp;<asp:Button ID="NewButton" runat="server" CausesValidation="False" CommandName="New" Text="Add New" /> </ItemTemplate> </asp:FormView>`\[/code\]If you pay attention there is no fields for "property_id" and "city_id" in formview. (I deleted them) My question is that: How can I edit these two columns' values ("property_id" and "city_id") before inserting? Because for example; "city_id" need to be a specific value accordingly "querystring". I hope I explained my problem clearly.