objectdatasource update method at code behind

I have a objectdatasource with specified UpdateParameters at page,
and I want to do the objectdatasource.update() at code behind
How do I full filled all the required updateparameters at code behind before I call the update()?

I've tried ODS1.UpdateParameters.Insert("cID", string123)

it didn't work, popup an error msg says "cannot find generic method "update" that has parameters (cID)

any help?
<asp:ObjectDataSource ID="ODS1" runat="server" 
              OldValuesParameterFormatString="original_{0}" UpdateMethod="Update">
                  <asp:Parameter Name="cID" Type="Int32" />
                  <asp:Parameter Name="cName" Type="String" />

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Hi! You may try this

        ODS1.UpdateParameters(0).DefaultValue = "Value1"
        ODS1.UpdateParameters(1).DefaultValue = "Value2"

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joeyluAuthor Commented:
yes, i was forced to use defaultvalues, but it doesn't quite the same anyway, guess there should be a better way
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