private void advTree4_MarkupLinkClick(object sender, DevComponents.AdvTree.MarkupLinkClickEventArgs e) { if (e.HRef == "del") { m_viewModel.DelVideoSupplierByID(Convert.ToUInt32(advTreeVideoSupplier.SelectedNode.Cells[0].Text)); advTreeVideoSupplier.DataSource = m_viewModel.VideoSupplierList; if (advTreeVideoSupplier.SelectedNode != null) { uint videoSupplierId = Convert.ToUInt32(advTreeVideoSupplier.SelectedNode.Cells[0].Text); advTreeCamera.DataSource = m_viewModel.GetCameraListByVideoSupplierID(videoSupplierId); } } }