Can I setup unbounded asp:TemplateField in asp:GridView

Hi,

I wanted to create  gridview that the users can update the value within grid. So, I have " <EditItemTemplate>" and <ItemTemplate> as shown below.

If I bind the grid to a datasource, is there a way that it doesn't really write to the database, but will update the grid? That is the changes show on the grid, but never write to the DB. Please advice. Your help would be greatly appreciated!

<asp:GridView ID="GridView2" runat="server" CellPadding="4"  
            ForeColor="#333333"  AutoGenerateColumns="False"  
            onrowcancelingedit="GridView1_RowCancelingEdit"  
            onrowdeleting="GridView1_RowDeleting" onrowediting="GridView1_RowEditing"  
            onrowupdating="GridView1_RowUpdating" > 
            <AlternatingRowStyle BackColor="White" /> 
            <Columns> 
                <asp:TemplateField Visible="False">   

                    <ItemTemplate> 
                        <asp:Label ID="lblPk_id" runat="server"  Text='<%#Eval("xxx")%>'></asp:Label> 
                    </ItemTemplate> 
                </asp:TemplateField> 
                <asp:TemplateField Headertext="ProductId"> 
                    <EditItemTemplate> 
                        <asp:TextBox ID="txtaaa" runat="server"  Text='<%#Eval("aaa")%>'></asp:TextBox> 
                    </EditItemTemplate> 
                    <FooterTemplate> 
                    <asp:TextBox ID="txtaaa" runat="server"  Text='<%#Eval("aaa")%>'></asp:TextBox> 
                    </FooterTemplate> 
                    <ItemTemplate> 
                        <asp:Label ID="lblaaa" runat="server"  Text='<%#Eval("aaa")%>'></asp:Label> 
                    </ItemTemplate> 
                </asp:TemplateField>