protected void Page_Load(object sender, EventArgs e, GridViewRowEventArgs d)
        {
            GridViewMaus.GridView_RowDataBound(sender, d);
            DynamicButton(d);
        }

private void DynamicButton(GridViewRowEventArgs e)
        {
            Button btn_Doku = new Button();
            //Text für Button festlegen
            btn_Doku.Text = "Doku aufrufen";
            // Name des Buttons festlegen
            btn_Doku.ID = "btn_Doku";
            //Ereignis zuordnen
            btn_Doku.Click += new EventHandler(this.btn_Doku_Click);
            if (e.Row.Cells[8].Text == "" | e.Row.Cells[8].Text == null | e.Row.Cells[8].Text == " ")
            {
                btn_Doku.Enabled = false;
                btn_Doku.Text = "Doku fehlt";
            }           
            else
            {
                btn_Doku.BackColor = System.Drawing.Color.LightBlue;
                btn_Doku.Text = "Doku aufrufen";
            }
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                e.Row.Cells[7].Controls.Add(btn_Doku);
            }
        }

void btn_Doku_Click(object sender, EventArgs e)
        {

            //ausgewählte Zeile des Gridviews auslese        
            GridViewRow t = (GridViewRow)(sender as Control).NamingContainer;
            // String der Ausfalldoku zusammenstellen
            string vNotesLink = t.Cells[8].Text;
            // externes Programm Notes mit Link-ID starten    
            System.Diagnostics.Process.Start(vNotesLink);
          
        }