Use .Ascx files(webusercontrol) to create the Left menu and Inside Ascx.cs file write the data base actions
<asp:Menu ID="Menu1" DataSourceID="xmlDataSource" runat="server"
DynamicHorizontalOffset="2" StaticSubMenuIndent="10px" Width="145px"
OnMenuItemClick="Menu1_MenuItemClick" >
<DataBindings>
<asp:MenuItemBinding DataMember="MenuItem"
TextField="Text" ToolTipField="ToolTip" />
</asp:Menu>
You have to use xmlDataSource (.xsl file) to list menus