Button btn =new Button ();
        btn.ID ="btn1";
        btn.Text ="btn";
        Label lbl =new Label ();
        lbl.ID="lbl1";
        lbl.Text ="lbl";
        Literal literal =new Literal ();
        literal.Text="<br>";

        GridView1.Rows[1].Cells[5].Controls.Add(btn);
        GridView1.Rows[1].Cells[5].Controls.Add(literal);
        GridView1.Rows[1].Cells[5].Controls.Add(lbl);