Getting SQLDataSource Update Parameter from Gridview - asp.net

Question

I am trying to get a parameter for my update from the gridview but it is an ID column that I do not want displayed. If I display the data in a boundfield it works fine but if I set the visibility to false the parameter is no longer sent to the update stored procedure. There does not appear to be a hiddenfield column that I can put into the gridview.
I have tried to set the parameters through the code behind but I am not certain on how to access the data I want the following code does not work (It sets the parameter to nothing
Protected Sub grvFacilityDisciplineBillingRate_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs) Handles grvFacilityDisciplineBillingRate.RowUpdating
Dim row As GridViewRow = grvFacilityDisciplineBillingRate.Rows(e.RowIndex)
sqlDisciplineBillingRate.UpdateParameters("Facility_ID").DefaultValue = CInt(row.DataItem("Facility_ID"))
sqlDisciplineBillingRate.UpdateParameters("Discipline_ID").DefaultValue = CInt(row.DataItem("Discipline_ID"))
End Sub
And this is the front end with the two ID columns displayed, which is not what I want
<asp:SqlDataSource ID="sqlDisciplineBillingRate" runat="server" DataSourceMode="DataSet" SelectCommandType="StoredProcedure" SelectCommand="SP_Facility_DisciplineBillingRates" UpdateCommandType="StoredProcedure" UpdateCommand="SP_DiscplineBillingRate_Update" ConnectionString="<%$ ConnectionStrings:Trustaff_ESig2 %>">
<SelectParameters>
<asp:Parameter Name="Facility_ID" DbType="Int32" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="Facility_ID" DbType="Int32" />
<asp:Parameter Name="Discipline_ID" DbType="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:GridView ID="grvFacilityDisciplineBillingRate" runat="server" DataSourceID="sqlDisciplineBillingRate" DataKeyNames="DisciplineBillingRate_ID" AutoGenerateColumns="false" AllowSorting="true" AllowPaging="false" AutoGenerateEditButton="true" CssClass="gridview">
<EmptyDataTemplate>
There were no discipline billing rates for this facility.
</EmptyDataTemplate>
<Columns>
<asp:BoundField DataField="Name" HeaderText="Discipline" SortExpression="Name" ReadOnly="true" />
<asp:BoundField DataField="BillingRate" HeaderText="Billing Rate" SortExpression="BillingRate" />
<asp:BoundField DataField="Facility_ID" HeaderText="Facility_ID" SortExpression="Facility_ID" InsertVisible="false" />
<asp:BoundField DataField="Discipline_ID" HeaderText="Discipline_ID" SortExpression="Discipline_ID" />
</Columns>
</asp:GridView>

Answer 1

You simply have to set the DataKeyNames e.g. DataKeyNames="Facility_ID,Discipline_ID" and the SqlDataSource will figure it out for you when using GV's Update and Delete feature.

Answer 2

Try using Template fields and use a label control and hide them by setting visible="false".
<asp:TemplateField HeaderText="College">
<ItemTemplate>
<asp:Label ID="lbl_Title" runat="server" text='<%# Bind("Title") %>' visible="false"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
And use below code to access values from codebehind.
If gvrow.RowType = DataControlRowType.DataRow Then
Dim label1 As Label = DirectCast(gvrow.FindControl("lbl_Title"), Label)
'Access text of label using label1.text and cast to int or string
End If
You can eliminate using templated fields if you don't wish for ID columns. And still access it using datakeynames property