How to change bound fields in Gridview dynamically

Hi, I am new to using Object Data Source and am curious as far as its cusomizing limits. I would like to use the object Data Source in Gridview and am wondering the following things. I am using VB.NET in the code behind

1) Can the bound field names in the Gridview be changed at runtime / dynamically? for ex
<Columns>
        <asp:BoundField DataField="ProductName"
           HeaderText="ProductName" SortExpression="ProductName" />
        <asp:BoundField DataField="CategoryName" HeaderText="Category"
           ReadOnly="True"
</Columns>
Can I change the Bound field Data field in runtime since I am pulling data from different tables so the field names would be different, Is it possible to do this?

2) I want to do the same for a Dropdown template column. I want to be able to pull the lists of different types of products from different tables as well . Because from what I have seen If I use Edit Item Template and a seperate object Data source for the Drop down I have to assign the DataValue and text fields in the Data Source configuration Wizard.  Can I modify for e.g the following code in Code behind in VB.NET as well to give the label and the drop down different field names to bind to?

<asp:TemplateField HeaderText="Category" SortExpression="CategoryName">
    <EditItemTemplate>
        <asp:DropDownList ID="Categories" runat="server"
          DataSourceID="CategoriesDataSource"
          DataTextField="CategoryName" DataValueField="CategoryID">
        </asp:DropDownList>
        <asp:ObjectDataSource ID="CategoriesDataSource" runat="server"
            OldValuesParameterFormatString="original_{0}"
            SelectMethod="GetCategories" TypeName="CategoriesBLL">
        </asp:ObjectDataSource>
    </EditItemTemplate>
    <ItemTemplate>
        <asp:Label ID="Label1" runat="server"
          Text='<%# Bind("CategoryName") %>'></asp:Label>
    </ItemTemplate>
</asp:TemplateField>

Thanks to anyone who can help me out with this. Please provide a sample of the code behind if this is possible. Your help's really appreciatedStart Free Trial