>>OK, I found some sample code on-line and this is what I can try:
>>
>>

<asp:ObjectDataSource ID="odsRiders" runat="server" SelectMethod="GetRidersAndWaiversByPlan"
>>                                    TypeName="SamaanSystems.IAS.Business.Plan">
>>                                    <selectparameters>
>>                                        <asp:querystringparameter name="planPK"  querystringfield="planpk" defaultvalue="-1" />
>>                                    </selectparameters>
>>                                    </asp:ObjectDataSource>

>>
>>However, I am not using a querystring to pass in the value I need. I can access the value in the aspx.cs file like this: this.oPolicy.Entity.PlanFK
>>
>>So how would I use that in the aspx file?
>
>For your case the only way is to specify generic parameter Parameter Name = "PlanPK" type = "Int32"
>
>and then set your parameter's value in Selecting event of ObjectDataSource.
>
>I have a blog on a similar problem (for SQLDataSource), never tried myself this technique with ObjectDataSource. When you get it to work, post your code and I'll update my blog with your sample:
>
>See here
>http://blogs.lessthandot.com/index.php/WebDev/WebDesignGraphicsStyling/setting-sqldatasource-parameter-from-the

Thanks again, but I couldn't find the stuff you referenced on the blog that was specific/similar to what I am trying to do (or at least I couldn't understand it, which is the more likely thing).

I think that what you are trying to tell me is:

1. create the ObjectDataSource like this:

<asp:ObjectDataSource ID="odsRiders" runat="server" SelectMethod="GetRidersAndWaiversByPlan"
                                    TypeName="SamaanSystems.IAS.Business.Plan">
                                    <selectparameters>
                                        <asp:parameter name="planPK" type="Guid" />
                                    </selectparameters>
                                    </asp:ObjectDataSource>

2. in my code behind file create method like this:

        protected void odsRiders_Selecting(object sender, SqlDataSourceCommandEventArgs e)
        {
            e.Command.Parameters["@PlanPK"].Value = this.oPolicy.Entity.PlanFK;
        }

Is that correct?

Another issue is that I can't create a Guid parameter and all my primary keys are Guids/uniqueidentifiers.