C# Datagridview selected row -

i have datagridview have implemented search function. entering characters while datagridview in focus first row of grid characters selected.

i use:

dtgview[index].selected = true; dtgview.firstdisplayedscrollingrowindex = index; 

the row gets selected, when press or down arrows navigate or down selected row, datagridview starts row index 0 in datagrid , not newly selected row?

here op's original code / method

private void dtgview_keyup(object sender, keyeventargs e) {     if (e.keyvalue >= 65 && e.keyvalue <= 90 )     {         searchstrings += e.keycode;         (int = 0; < dtgview.rowcount; i++)         {             if (dtgview.rows[i].cells[0].value.tostring().                 substring(0, searchstrings.length) == searchstrings)             {                 dtgview.clearselection();                 dtgview.firstdisplayedscrollingrowindex = i;                 dtgview.rows[i].selected = true;                 dtgview.rows[i].cells[0].selected = true;                 break;             }         }     }  } 

this key_up event on dtg:

private void dtgview_keyup(object sender, keyeventargs e)         {             if (e.keyvalue >= 65 && e.keyvalue <= 90 )             {                 searchstrings += e.keycode;                 (int = 0; < dtgview.rowcount; i++)                 {                     if (dtgview.rows[i].cells[0].value.tostring().                         substring(0, searchstrings.length) == searchstrings)                     {                          dtgview.clearselection();                         dtgview.firstdisplayedscrollingrowindex = i;                         dtgview.rows[i].selected = true;                         dtgview.rows[i].cells[0].selected = true;                          break;                     }                 }             }          }