Hi, I have a drop down list, and I added some items in it as follows

        <asp:DropDownList ID="ddlInsAuther" runat="server" 
            DataSourceID="ObjectDataSourceInsAuthers" DataTextField="AutherName" 
            DataValueField="AutherID">
        <asp:ListItem Value="-1">No Authers</asp:ListItem>
        </asp:DropDownList>

And in Datasource

        <asp:ObjectDataSource ID="ObjectDataSourceInsAuthers" runat="server" 
            SelectMethod="GetAll" TypeName="MyProject.BusinessLayer.AuthersFactory">
        </asp:ObjectDataSource>

When it loads it clears the list and loads the new items, I don't want to make a custom binder on page load, how can I maintain my added items in the list while binding from datasource?