I am trying to develop an add-in to catch and stop file deletions within PDM Professional so can be handled in accordance with our policies.

I have been successful in catching the predelete with:

     "poCmdMgr.AddHook(EdmCmdType.EdmCmd_PreDelete)"

and in the OnCmd section stopping the operation with:

     "poCmd.mbCancel = True"

But I still get a warning box or error.

"Error deleting File. Cause: The operation was not permitted by one of the installed add-ins."

I have tried including in a Try statement ending with catches:

    "

     Try

               poCmd.mbCancel = True

        Catch ex As Runtime.InteropServices.COMException

            Select Case ex.ErrorCode

                Case EPDM.Interop.EPDMResultCode.EdmResultErrorCodes_e.E_EDM_OPERATION_REFUSED_BY_PLUGIN

                    MessageBox.Show("Test")

                Case Else

                    MessageBox.Show("HRESULT = 0x" +

                    ex.ErrorCode.ToString("X") + vbCrLf +

                    ex.Message)

            End Select

        Catch ex As Exception

            MessageBox.Show(ex.Message)"

but this don't seem to catch.

Any help would be appreciated