OnRowCommand Problem, ASP.NET

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C#

ASP.NET

Hello..
I have a funny problem with my OnRowCommand in gridview.
I`ve add a template field, button, which is bind with datakey in gridview, to update a record.
The idea is: on command btn_update, take all the fields from that record and populate textboxes with it.

if (e.CommandName == "btn_update")
            {
                int id1 = Convert.ToInt32(e.CommandArgument);

                Session["naziv"] = gv_artikli.Rows[id1].Cells[1].Text;
                Session["proizvodac"] = gv_artikli.Rows[id1].Cells[2].Text;
                Session["vrsta"] = gv_artikli.Rows[id1].Cells[3].Text;
                Session["oblik"] = gv_artikli.Rows[id1].Cells[4].Text;
                Session["cijena"] = float.Parse(gv_artikli.Rows[id1].Cells[5].Text);
                Session["opis"] = gv_artikli.Rows[id1].Cells[6].Text;
                Session["participacija"] = gv_artikli.Rows[id1].Cells[7].Text;
                
                PostaviTextBox();
}
public void PostaviTextBox()
{
 txt_id.Text = Session["ArtikalID"].ToString();

              txt_naziv.Text = Session["naziv"].ToString();
              txt_cijena.Text = Session["cijena"].ToString();
              txt_oblik.Text = Session["oblik"].ToString();
              txt_opis.Text = Session["opis"].ToString();
              dp_proizv.SelectedItem.Text = Session["proizvodac"].ToString();
              dp_vrsta.SelectedItem.Text = Session["vrsta"].ToString();
              dp_partc.SelectedItem.Text = Session["participacija"].ToString();
}

That works "fine"- except: if I click for example on record which ID=4, in textboxes it will be shown records for ID=8, and so on..
Any Idea?
Also, I must mention that template field which delete records- works just fine (if ID=4 it will delete ID=4).