c# - Move data to next cell on click when repopulating a grid after update -

populate grid view , on cell click populate text box on cell click event like,

   private void dgvcompany_cellclick(object sender, datagridviewcelleventargs e)         {             int = dgvcompany.selectedcells[0].rowindex;             id = dgvcompany.rows[i].cells[0].value.tostring();             txtcompanyname.text = dgvcompany.rows[i].cells[1].value.tostring();             txtcontactname.text = dgvcompany.rows[i].cells[2].value.tostring();             txtcontactpersonphone.text = dgvcompany.rows[i].cells[3].value.tostring();             txtaddress.text = dgvcompany.rows[i].cells[4].value.tostring();             txtcity.text = dgvcompany.rows[i].cells[5].value.tostring();             txtphone.text = dgvcompany.rows[i].cells[6].value.tostring();             cbisactive.checked = convert.toboolean(dgvcompany.rows[i].cells[7].value);         } 

here id string variable after populating text box edit , save update , refill grid previous method like,

public void fillcompanyinfo()         {             datatable dtcompanyinfo = objfunctions.getcompanyinfo();             if(dtcompanyinfo.rows.count>0)             {                  dgvcompany.datasource = dtcompanyinfo;                 if (this.dgvcompany.columns.count == 8)                 {                     datagridviewcheckboxcolumn checkcolumn = new datagridviewcheckboxcolumn();                     checkcolumn.name = "";                     checkcolumn.headertext = "select";                     checkcolumn.width = 50;                     checkcolumn.readonly = false;                     checkcolumn.fillweight = 10; //if datagridview resized (on form resize) checkbox won't take much; value relative other columns' fill values\\                     dgvcompany.columns.add(checkcolumn);                 }             }         } 

here use if condition counting column 8 because each time add column select , after populating grid again when click on grid , cell click event fire result in error ,

on line ,

 id = dgvcompany.rows[i].cells[0].value.tostring(); 

object reference not found because getting null on cell 0 while working fine before update on cell click , when use break point getting id on cells[1] , cell[0] null

i not understanding error

hopes suggestion

thanks