private void btnUpdateCOIRequest_Click(object sender, RoutedEventArgs e)
{
    // Update COI Request Workflow:
    // Create Update COI Request - Request ID is retured.
    // Send the COI PDF document associated with the Request ID.
    // Note: An existing 'Other' type submitter id is required for the Update COI request.
 
    updateCOIRequest(); // If successfull the tbRequestID.Text field will have the new Request ID.
 
    sendPDFFile("COIRequest");
}