Gridview's SelectedRow property is used for which gridview' events for finding controls inside gridview?

Selected_IndexChanged is the only Gridview event, in which we can use SelectedRow Property to find any control withing gridview as below :-

Label lbl_answer = gridview1.SelectedRow.FindControl("lbl_question_answer") as Label;

We can use Row_Updating event to find controls as
Label lbl_answer = gridview1.Rows[e.RowIndex].FindControl("lbl_question_answer") as Label;

Row_Cancel event is only used to cancel any rows which are being editing.