Do I have to flush command queue before calling IDXGISwapChain::Present?

Do I have to flush command queue before calling IDXGISwapChain::Present?

void MyApp::OnPaint() {
    //.....
    FlushCommandQueue(); // flush the command queue.
    m_dxgiSwapChain->Present( 0, 0 );
}

void MyApp::FlushCommandQueue() {
    m_CommandQueue->Signal( m_Fence, ++m_CurrentFrame ); 
    m_Fence->SetEventOnCompletion( m_CurrentFrame, m_Fence, m_FenceEvent );
    WaitForSignleObject( m_FenceEvent, INFINITE );
}