private void buttonAddCamera_Click(object sender, EventArgs e) { if (advTreeVideoSupplier.SelectedNode != null) { FormAddEditCamera f = new FormAddEditCamera(); f.VideoSupplierId = Convert.ToUInt32(advTreeVideoSupplier.SelectedNode.Cells[0].Text); f.VideoSupplierNmae = advTreeVideoSupplier.SelectedNode.Cells[1].Text; f.ShowDialog(); m_viewModel.FlushCameraList(); advTreeCamera.DataSource = m_viewModel.GetCameraListByVideoSupplierID(f.VideoSupplierId); } }