private void buttonMutiAdd_Click(object sender, EventArgs e) { if (advTreeVideoSupplier.SelectedNode != null) { uint VideoSupplierId = Convert.ToUInt32(advTreeVideoSupplier.SelectedNode.Cells[0].Text); m_viewModel.AddCameraListByVideoSupplier(VideoSupplierId); m_viewModel.FlushCameraList(); advTreeCamera.DataSource = m_viewModel.GetCameraListByVideoSupplierID(VideoSupplierId); } }