arduino - start and stop C# -


i have datagridview different numbers. every time press start, selected row sent arduino.

now want press start , every row, select sent right away until press stop. 

private void btn_start_auto_click(object sender, eventargs e) {     if (isconnected)     {         port.write("#text" + length_txt.text + "#\n");     } }  private void btn_up_click(object sender, eventargs e) {     if (datagridview1.rows.count != 0)     {         selectedrow--;         if (selectedrow < 0)         {             selectedrow = datagridview1.rowcount - 1;         }         datagridview1.rows[selectedrow].selected = true;         datagridview1.firstdisplayedscrollingrowindex = datagridview1.selectedrows[0].index;     } }

i don't know how "set" start "signal" , and reset stop button.

you write code in event grid row click maybe row click even


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