Detailsview templatefield mapping to ObjectDataSource? - asp.net

Question

I need help to understand the proper way to map or associate TemplateFields to the ObjectDataSource. I show only one (of many) template definitions here:
<asp:TemplateField HeaderText="First Name" SortExpression="cFIRSTNAME">
<ItemTemplate>
<asp:Label ID="lblValFirstName" runat="server" Text='<%# Eval("cFIRSTNAME") %>' style="font-weight: bold;" ></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtFirstName" runat="server" Text='<%# Bind("cFIRSTNAME") %>' MaxLength="20"></asp:TextBox>
</EditItemTemplate>
<InsertItemTemplate>
<asp:TextBox ID="txtFirstName" runat="server" Text='<%# Bind("cFIRSTNAME") %>' MaxLength="20"></asp:TextBox>
</InsertItemTemplate>
</asp:TemplateField>
The ObjectDataSource and update parameters are:
<asp:ObjectDataSource ID="ODS_LOGIN_DETAILS" runat="server"
SelectMethod="GetLOGINSbyLoginID"
TypeName="bllLOGINS"
DeleteMethod="DeleteFromDetailsView"
InsertMethod="InsertFromDetailsView"
UpdateMethod="UpdateFromDetailsView" OldValuesParameterFormatString="original_{0}"> <UpdateParameters>
<asp:Parameter Name="p_UID_LOGIN" Type="Int32" />
<asp:Parameter Name="p_UID_CONTACT" Type="Int32" />
<asp:Parameter Name="p_UID_USER_TYPE" Type="Int32" />
<asp:Parameter Name="p_TXT_USERNAME" Type="String" />
<asp:Parameter Name="p_TXT_PASSWORD" Type="String" />
<asp:Parameter Name="p_BOOL_IS_ACTIVE" Type="Boolean" />
<asp:Parameter Name="p_DT_END" Type="DateTime" />
<asp:Parameter Name="p_FirstName" Type="String" />
<asp:Parameter Name="p_LastName" Type="String" />
<asp:Parameter Name="p_CONTACTTITLE" Type="String" />
<asp:Parameter Name="p_TXT_PHONE" Type="String" />
<asp:Parameter Name="p_CONTACT_EMAIL" Type="String" /> </UpdateParameters>
What is NOT clear to me is how is the mapping made from the templatefield textbox (txtFirstName) to the UpdateParameter "p_FirstName"?
In the existing code I am working with, I see the ObjectDataSource_Updating()-event that does a series of DVW.FindControl() values being assigned/set to the
e.InputParameter("param-name") = text-box-value
Questions?
Is this done in either the ObjectDataSource_Updating()-event or in the DetailsView_Updtaing()-event -or- by declaration aspx code?
or how?
What is the best way to do this?
Would naming the textbox-ID and the parameter-name simplify the code?
I am assuming the solutions offered would be "similar" or the same as with SqlDataSource -- please confirm?
Thanks in advance...John

Answer 1

I had a similar problem and was unsure how to map the textbox to the params as was getting NULL param value passed when doing a SQL trace. In the end I set the parameter name to match the value in the Text attribute bind which worked.
<UpdateParameters>
<asp:Parameter Name="my_field" Type="String" Direction="Input" />
...
<asp:TextBox Text='<%# Bind("my_field") %>'...