Get Gridview RowIndex on RowDataBound and RowCommand gridview in asp.net

//*************** On RowCommand

 GridViewRow gvr = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
            int rnd = gvr.RowIndex;  //Row Index



//*************** On RowDataBound

int rnd= e.Row.RowIndex;   //Row Index