OpenFileDialog + OleDbConnection = AccessViolationException

private void Test()
{
	this.table1TableAdapter.GetData();
}

private void SaveDialogTest()
{

	SaveFileDialog saveFileDialog1 = new SaveFileDialog();
        saveFileDialog1.Filter = "Text File|*.txt";
        saveFileDialog1.InitialDirectory = Application.StartupPath;
        saveFileDialog1.Title = "test";
        saveFileDialog1.ShowDialog();:mad:

        if (saveFileDialog1.FileName != "")
                 { }
}

private void button1_Click(object sender, EventArgs e)
{
        Test();
	SaveDialogTest();           
}

private void Form1_Load(object sender, EventArgs e)
{
            // TODO: This line of code loads data into the 'testDataSet.Table1' table. You can move, or remove it, as needed.
            this.table1TableAdapter.Fill(this.testDataSet.Table1);

}

SaveDialogTest();
Test();
SaveDialogTest();

On windows 7 (32 bit) had same problem when showing the openfiledialog from a modal form loaded for the second time with data from db in it. Solution appeared to be: do not allow autoupgrade of dialog.
Dim sfv As New System.Windows.Forms.SaveFileDialog
   With sfv
     .AutoUpgradeEnabled = False
     [...]


But error came up again. Then I noticed it was apparently randomic till I realized it did not come out ifd I was able to show a saveFileDialog or an OpenfileDialog before loading any data from db.

Thus true workaround is: before load anything on the form you're going to show, display a dialog asking user to choose a path and file you *might* need after (arrrg!). After that, load data. Now your can let users, if needed, to choose path and file with dialog again...

ie:
  Private Sub frmReport_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
     txtFilePathName.Text = "Export_" & Now.ToString("yyyy_MM_dd_HH_mm_ss", CultureInfo.GetCultureInfo("it-It")) & ".csv"
     txtFilePathName.Text = GetSaveFileName(txtFilePathName.Text, ".csv", "Choose a csv File to save exported data", "csv |*.csv|All |*.*")
     'now load data in forms, where you can also have a button to call again the GetSaveFileName
[...]

Private Function GetSaveFileName(ByVal fileName As String,
                                    ByVal defaultExtension As String,
                                   ByVal title As String,
                                   ByVal filter As String) As String
        Dim sfv As New System.Windows.Forms.SaveFileDialog
        With sfv
            .RestoreDirectory = True
            .AddExtension = True
            .DefaultExt = defaultExtension
            .FileName = fileName
            .Title = title
            .Filter = filter
            .CheckPathExists = True
            .OverwritePrompt = True
            .ShowHelp = False

            If (.ShowDialog = DialogResult.OK) Then
                fileName = .FileName
            End If
        End With
        Return fileName
    End Function
Cimperiali