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Dataset/datatables as a source for a Datalist/Datagrid combination

I have a report with a datagrid in the ItemTemplateColumn of a datalist.
The datalist is populated with one stored procedure call to the database
and the datagrid with a second stored procedure call on every datalist
ItemDataBound event.

I want to change this.

I want to make one stored procedure call and populate one dataset
with two datatables containing the info I need and create a
datarelation to link the two.

I can see how to get it going to the point where the datalist item
is being populated, but at that moment I don't know how to get to the
dataset and get the data I need for the datagrid.

Is this feasible and if so can you help me where I'm stuck?

Thanks!

gregasm

You can modify the stored procedure to fill two datatables in the dataset by delimiting the queries with ';' like so:

SELECT * FROM Table1;SELECT * FROM Table2;SELECT * FROM Table3

When loaded into a dataset, you will get 3 tables in your dataset with the results from the 3 queries.

You can then bind the individual tables to the controls by references the tables by ordinal number:

myControl.datasource = myDs.tables(0);
myOtherControl.datasource = myDs.tables(1);

HTH,
Greg

JeffDrummond

ASKER

Yes, I have the dataset populated with two tables
and a datarelation conecting the two.

The datalist is bound to Table 1.

When a datalist row is populated, I need to
populate the datagrid with the child rows in Table 2.

This is where I'm stuck. How to get to the datasource
for the datagrid.

gregasm

To implement the master - details datagrid, you must bind the details grid to the relationship object.

Have a look at this msdn walkthrough:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbtskcreatingmasterdetailslistwithdatagrid.asp

ASKER CERTIFIED SOLUTION

gregasm

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JeffDrummond

ASKER

I have the datarelation set up. When I run the report now I am getting
an error: "A field or property with the name 'CaseDescript' was not found on the selected datasource."
The datasource is my datatable dtCaseTypes and the 'CaseDescript' column IS present in the
datasource.

This is my code-behind:

dtActivJPO = New DataTable
dtCaseTypes = New DataTable
'--set datatable to first table in dataset
dtActivJPO = ds.Tables(0)
'--set datatable to second table in dataset
dtCaseTypes = ds.Tables(1)
'--create relationship between the two datatables
drl = New DataRelation("JPOCaseTypes", _
ds.Tables(0).Columns("EmployeeID"), _
ds.Tables(1).Columns("EmployeeID"), False)
'--add the relationship to the dataset
ds.Relations.Add(drl)

dvActivJPO = New DataView(dtActivJPO)

dlActivJPO.DataSource = dvActivJPO
dlActivJPO.DataBind()

This is the datagrid which displays the child rows:

<asp:datagrid id=dgJPOCaseTypes runat="server" Width="770px" ShowFooter="True" CellPadding="2" GridLines="None" BorderWidth="0px" DataSource='<%# Container.DataItem.Row.GetChildRows("JPOCaseTypes") %>' autogeneratecolumns="False">

<Columns>
<asp:BoundColumn DataField="CaseDescript" SortExpression="CaseDescript" HeaderText="Caseload Types Assigned">
<HeaderStyle HorizontalAlign="Left" CssClass="ProductHeader"></HeaderStyle>
<ItemStyle HorizontalAlign="Left" CssClass="ItemStyle" VerticalAlign="Top"></ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:datagrid></TD>

JeffDrummond

ASKER

I've got this up and running. The columns not being found
in my previous post were BoundColumns, and I needed to
change them to template columns in order for the
GetChildRows to work.

So using the datarelation and the GetChildRows
method works perfectly.