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getting data binding parameters from another WebControl

I have two SqlDataSources that use two different stored procedures that
take parameters to populate two controls, one dependant on an element
of the other.

The first data source, PreBuyDataSourc e is bound to PreBuyDetailsVi ew
control and its parameters come from the session or request. The
stored procedure will always only find one row, and I found the
DetailsView control to be convenient.

The second data source, BudgetDataSourc e is bound to BudgetDetailsVi ew
control and one of the parameters is an element in the data present in
the PreBuyDetailsVi ew. Likewise, the stroed procedure will always only
find one row, and I found the DetailsView control to be convenient.

Specifically, the element that BudgetDataSourc e depends on is

PreBuyDetailsVi ew.DataItem.Ite m("PRBCODE")

....or in English, the column named PRBCODE (column index 3) that gets
returned from the stored procedure.

When I click on the SelectQuery to bring up the dialog for
BudgetDataSourc e's stored procedure, I have my parameters, one of which
needs to come from PRBCODE. I set my Parameter Source to "control." I
set my control ID to PreBuyDetailsVi ew. Under the advanced properties,
the property name defaults to SelectedValue, which appears blank to me.
I tried to set it to DataItem.Item(" PRBCODE"), but when I do that I
get an error: 'System.Data.Da taRowView' does not contain a property
with the name 'Item'.

System.Data.Dat aRowView DOES contain a public property named Item since
I can access it directly for instance by setting a labels text value to
PreBuyDetailsVi ew.DataItem.Ite m("PRBCODE"). However, my grasp of when
and where the databinding takes place for multiple controls is
admittedly weak.

I cannot figure out how to get the data binding on my BudgetDetailsVi ew
to use that value from PreBuyDetailsVi ew. I am new to ASP.NET and hope
I am either going about this in entirely the wrong way, or missing some
key bit of insight. Either way, can anyone tell me how I can set that
value as a parameter for my second data source?

Dec 5 '06 #1
0 1394

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