Edit search results in Gridview - Wrong row in edit mode

Hi.  I'm using Visual Studio 2005 with VB.

I have a gridview using a SQLDataSource  that allows users to edit and delete records.  That all works fine.  Now I am adding search functionality so that users can search on first and last names and date of birth using input controls that sit above the gridview.  That works fine too and the gridview displays the appropriate records matching the search criteria.  I modify the SelectCommand of the SQLDataSource when the "Find" button is clicked in order to retrieve matching records.

The problems start when I try to edit a record that has been returned by the search functionality.  When I click edit for a record, the gridview refreshes and displays ALL records and the row in edit mode is not the one that I selected.  Obviously the row ID is being used to decide which row should be in edit mode but because the result set has changed it's the wrong row.

I've tried using the Page_Load event to check if the search fields are populated, and if so, modify the SelectCommand of the SQLDataSource appropriately, but this has no effect.

How do I resolve this?  If my search has returned only one record then if I edit that record it should go into edit mode and still be the only record in the gridview.  

All help very much appreciated.
Cheers,
Danik
Danik_SAsked:
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mzalewskiCommented:
Have you tried setting it to not populate the datagrid on Postback?
if (!Page.IsPostback) {
datagrid.DataBind()
}
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Danik_SAuthor Commented:
Hi mzalewski

I haven't tried that, but being a gridview (not a datagrid) it takes care of its own binding automatically. So adding that code wouldn't change anything, would it?

Cheers,

Danik
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mzalewskiCommented:
Sorry, should have re-read your question.

Instead of modifying the SQL select statement, try using the SQLDataSource.FilterExpression Property.

Example:
 <asp:SqlDataSource
                id="SqlDataSource1"
                runat="server"
                ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
                SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"
                FilterExpression="Title='{0}'">
                <FilterParameters>
                    <asp:ControlParameter Name="Title" ControlId="DropDownList1" PropertyName="SelectedValue"/>
                </FilterParameters>
            </asp:SqlDataSource>

Dont know if it will work, but its probably worth a try.
Here's a link to where I found the example:
http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.sqldatasource.filterexpression.aspx
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Danik_SAuthor Commented:
Thanks mzalewski - it is starting to come together.

Do you know how I can get the filtering to work with more than one filter?  It works fine with just FirstName, but when I add LastName and/or date of birth, it doesn't seem to work at all.

Cheers,

Danik

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mzalewskiCommented:
You might have to dynamically generate the FilterExpression. If you're setting it like this:
FirstName='{1}' AND LastName='{1}'
But only one of those fields are being filled in:
FirstName='John' AND LastName=''

You could try this:
FilterExpression="(FirstName='{0}' OR '{0}'='') AND (LastName='{1}' OR '{1}'='') "

That would return true if FirstName found a match, or Firstname's value is empty.

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Danik_SAuthor Commented:
Thanks mzalewsk - that worked perfectly!

I just had to set the convertEmptyStringToNull property to false for the controls used in the filtering.

Cheers,

Danik
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