DetailsView with DropDownList

Hello, could someone help me, how to to transfer selected data in DropDownList back to DetailsView control to update its Datasource?Now I can update accessdatasource of all text boxs from DetailsView1 but DropDownList Selected data. Thanks   <asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DataKeyNames="ID" DataSourceID="AccessDataSource1" DefaultMode="Edit" Height="50px&q ...