Best way to custom edit records in ASP.NET?

<asp:DataGrid ID="GridView1" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundColumn DataField="RuleID" Visible="False" HeaderText="RuleID"></asp:BoundColumn>
        <asp:TemplateColumn HeaderText="Category">
        <ItemTemplate>
            <!-- in case we want to display an image -->
            <asp:Literal ID="litImage" runat="server">
            </asp:Literal>
            <asp:DropDownList ID="categoryListDropdown" runat="server"></asp:DropDownList>
         </ItemTemplate>
        </asp:TemplateColumn>

    </Columns>
</asp:DataGrid>

foreach (DataGridItem item in this.GridView1.Items)
    {
        DropDownList categoryListDropdown = ((DropDownList)item.FindControl("categoryListDropdown"));
        categoryListDropdown.Items.AddRange(listItems.ToArray());
    }