Selection String Empty when Refresh Report

I'm using CR2008 in VS 2008 (WinForms not Web). This seems like a fairly easy thing to do (was in VB6/CR8.5).
My program provides a list of reports via the FileDialog, grabs the report name, loads the report document with the report, then the viewer displays the report. Everything works great to that point, but then the user refreshes the report and the selection string is changed to "" (empty) and all records from the table are displayed. Is there something that I'm missing here?
I have tried both 8.5 and CR2008 reports with the same results. The login seems to be working fine.
Any help would be appreciated,
Thanks
RA Smith
Puzzled
Code:
Private Sub OpenCrystalReportDirectoryToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenCrystalReportDirectoryToolStripMenuItem.Click
If FileIO.FileSystem.DirectoryExists(dirPath) = False Then
MsgBox("Crystal Reports Directory not valid. " & _
"Check that drive is mapped to S: drive.", MsgBoxStyle.Exclamation)
Else
Me.OpenFileDialog1.InitialDirectory = dirPath
If OpenFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Try
rptName = OpenFileDialog1.FileName
If FileIO.FileSystem.DirectoryExists(rptName) = True Then
MsgBox("File not found", MsgBoxStyle.Exclamation)
Else
Me.reportDocument1.Load(rptName, OpenReportMethod.OpenReportByTempCopy)
Me.CrystalReportViewer1.ReportSource = Me.reportDocument1
End If
Catch Ex As Exception
MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
End Try
End If
End If
End Sub

Ludek,
This application does nothing but allow the user to select a report from a shared folder on our company server and display. The report comes in with the correct selection string but with "old" data. When the refresh button is pressed from the CR Viewer the selection changes to an empty string, therefore, displaying all records in the database table.
The report that I'm currently trying to display has no parameter fields. The selection string in the report is:
{table.amt} > 0.00 and {table.paid} <> "y"
So do I need to save this selection string and set it each time the user presses REFRESH? What happens when I move to a report that has parameters?
I'm still reading microsoft help for VS2008/CR2008 but haven't found anything yet. Not to say that I didn't miss a step here or there. The only other thing that I noticed was a setting on the reportDocument called ReportAppServer which was set to <EMBEDDED_REPORT_ENGINE>. I have been trying to locate information on this setting but there are no other options on the properties screen. Could this be part of my problem? I pulled the reportDocument from the toolbox onto the windows form.
I did not have a problem with this in the old VB6/CR8.5 viewer that I'll be replacing over the next few months as I move from VB6/CR8.5 to VS2008/CR2008.
Thanks,
RA Smith

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William Wallace wrote:
I am trying to refresh a report with dynamic action. And getting the following errors:
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I have identified the problematic part. I have a multi-select select list and my query goes like this:
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I'm using CR2008 in VS 2008 (WinForms not Web).   This seems like a fairly easy thing to do (was in VB6/CR8.5).
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