Anyone who knows what is wrong?

GridViewRow row = GridView1.SelectedRow;

txtArtikelnummer.Text = row.Cells[1].Text;

txtArtikelomschrijving.Text = row.Cells[2].Text;

txtPrijs.Text = row.Cells[3].Text;

txtKortingscode.Text = row.Cells[4].Text;

_controller.setSessionList(txtArtikelomschrijving.Text);

for (int i = 0; i < _controller.getSessionList().Count; i++)

{

GridView GridView2 = new GridView();

GridView2.DataSource = _controller.getSessionList()[i];

GridView2.DataBind();

panel.Controls.Add(GridView2);

}