How to get value from a grideview cell on rowUpdating event?

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ASP.NET

Now,there are two Coloumns As

<asp:BoundField DataField="PageName" HeaderText="名称" HeaderStyle-HorizontalAlign="Left"> </asp:BoundField>
<asp:BoundField DataField="Path" HeaderText="路径" HeaderStyle-HorizontalAlign="Left">

So how can I get cell's value by function ExtractValuesFromCell on GridView_RowUpdating Event ?

GridViewMenu.Columns[3].ExtractValuesFromCell(e.NewValues, row.Cells[3] as DataControlFieldCell, DataControlRowState.Edit, false);
 GridViewMenu.Columns[4].ExtractValuesFromCell(e.NewValues, row.Cells[4] as DataControlFieldCell, DataControlRowState.Edit, false);</pre>

ExtractValuesFromCell how to store thoese values?