in your gird aspx page, set the DataKeyNames property as your key column name, for example if it is ID then
asp:GridView DataKeyNames ="ID"
then in your event method you can get the id value as below
grdOdGovori.DataKeys(e.RowIndex).Value
ref:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.datakeynames(v=vs.110).aspx[
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if you have multiple keys as below
asp:GridView DataKeyNames ="ID,ID2"
then you can get each key as below
grdOdGovori.DataKeys(e.RowIndex).Values("ID1").ToString()
and
grdOdGovori.DataKeys(e.RowIndex).Values("ID2").ToString()