<EditItemTemplate>
                    <asp:DropDownList ID="ddl1" runat="server" 
                            DataSourceID="SqlDataSource3"
                            DataTextField="name"
                            DataValueField="id"
                            SelectedValue='<%# Bind("id") %>'>

                            
                    </asp:DropDownList>
                </EditItemTemplate>

<asp:SqlDataSource ID="appDS" runat="server" 
            ConnectionString="<%$ ConnectionStrings:ApplicationServices %>" 
            SelectCommand="select id
                                ,name
                           from categories 
                           where parentid=980">
        </asp:SqlDataSource>
<asp:TemplateField HeaderText="app">
                <EditItemTemplate>
                    <asp:DropDownList ID="ddl1"
                                    runat="server"  
                                    DataSourceID="appDS"
                                    DataTextField="name" 
                                    DataValueField="id" 
                                    SeletedValue='<%# Bind("id") %>'  />
                </EditItemTemplate>
                <InsertItemTemplate>
                    <asp:DropDownList ID="ddl1"
                                    runat="server"  
                                    DataSourceID="appDS"
                                    DataTextField="name" 
                                    DataValueField="id" 
                                    SeletedValue='<%# Bind("id") %>'  />
                </InsertItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Eval("MPapp") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>