c# - how to get value of selected row in DropDown and Grid view -

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i have 2 question... 1. have gridview bind data form database way

datasource = company.getallcompany();         dgvcompanys.autogeneratecolumns = false;         dgvcompanys.datasource = _datasource;          dgvcolnameen.datapropertyname = "myenglishname";         dgvcoladdress.datapropertyname = "myaddress";         dgvcolcode.datapropertyname = "mycode";         dgvcolkeyid.datapropertyname = "mykeyid";

it's worked want keyid of selected row

private void dgvcompanys_selectionchanged(object sender, eventargs e)     {          if (dgvcompanys.selectedrows.count > 0)         {         mtxtcode.text=dgvcompanys.selectedrows[0].cells[1].value.tostring();         }     }

this code have error object reference not set instance of object. have this? question 2.i have textboxdropdownlist(devcomponent) , sourced way:

list<company> _datacompany; _datacompany = company.getallcompany();         cmbcompany.displaymember = "myenglishname";         cmbcompany.datasource = _datacompany;

that worked correctly want keyid of rows selected in dropdown have do?

question 1 : perhaps dataset have 1 column, right code :

dgvcompanys.selectedrows[0].cells[0].value.tostring();

question 2 not clear me, can access selected item :

dropdown.selecteditem.tostring()

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