NO CODING : 3 Nested Gridviews

Table Name : Music
Table Fields : Genre, Album., Title

Dont need writing VB/C# code for this sample

I like design mode, dont like writing code too much. So, this is my sample code creating NESTED Gridviews without VB/C# code. To use this code simply create table like above and create connection string in web.config called "TESTConnectionString" and copy-paste code below to your aspx page.

ASPX

<form id="form1" runat="server">
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" 
        CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="Black" 
        GridLines="Horizontal" ShowHeader="False" Width="100%">
        <Columns>
            <asp:TemplateField HeaderText="Genre" SortExpression="Genre">
                <ItemTemplate>
                    Genre :
                    <asp:Label ID="Label1" runat="server" style="color: #FF0000; font-weight: 700;" 
                        Text='<%# Bind("Genre") %>'></asp:Label>
                    <br />
                    <table class="style1">
                        <tr>
                            <td class="style2">
                                &nbsp;</td>
                            <td>
                                <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" 
                                    DataSourceID="SqlDataSource1" GridLines="None" ShowHeader="False" Width="100%">
                                    <Columns>
                                        <asp:TemplateField HeaderText="Album" SortExpression="Album">
                                            <ItemTemplate>
                                                Album :
                                                <asp:Label ID="Label1" runat="server" style="color: #0000FF; font-weight: 700" 
                                                    Text='<%# Bind("Album") %>'></asp:Label>
                                                <asp:HiddenField ID="HiddenField1" runat="server" 
                                                    Value='<%# Bind("Genre") %>' />
                                                <table class="style1">
                                                    <tr>
                                                        <td class="style2">
                                                            &nbsp;</td>
                                                        <td>
                                                            <asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="False" 
                                                                BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" 
                                                                CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="Black" 
                                                                GridLines="Vertical" ShowHeader="False" Width="100%">
                                                                <RowStyle BackColor="#F7F7DE" />
                                                                <Columns>
                                                                    <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
                                                                </Columns>
                                                                <FooterStyle BackColor="#CCCC99" />
                                                                <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
                                                                <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
                                                                <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
                                                                <AlternatingRowStyle BackColor="White" />
                                                            </asp:GridView>
                                                        </td>
                                                    </tr>
                                                </table>
                                                <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                                                    ConnectionString="<%$ ConnectionStrings:TESTConnectionString %>" 
                                                    SelectCommand="SELECT [Title] FROM [Music] WHERE (([Album] = @Album) AND ([Genre] = @Genre)) ORDER BY [Title]">
                                                    <SelectParameters>
                                                        <asp:ControlParameter ControlID="Label1" Name="Album" PropertyName="Text" 
                                                            Type="String" />
                                                        <asp:ControlParameter ControlID="HiddenField1" Name="Genre" 
                                                            PropertyName="Value" Type="String" />
                                                    </SelectParameters>
                                                </asp:SqlDataSource>
                                            </ItemTemplate>
                                            <EditItemTemplate>
                                                <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Album") %>'></asp:TextBox>
                                            </EditItemTemplate>
                                        </asp:TemplateField>
                                    </Columns>
                                </asp:GridView>
                            </td>
                        </tr>
                    </table>
                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                        ConnectionString="<%$ ConnectionStrings:TESTConnectionString %>" 
                        SelectCommand="SELECT DISTINCT [Album], [Genre] FROM [Music] WHERE (([Genre] = @Genre) AND ([Album] IS NOT NULL))">
                        <SelectParameters>
                            <asp:ControlParameter ControlID="Label1" Name="Genre" PropertyName="Text" 
                                Type="String" />
                        </SelectParameters>
                    </asp:SqlDataSource>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Genre") %>'></asp:TextBox>
                </EditItemTemplate>
            </asp:TemplateField>
        </Columns>
        <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
        <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
        <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:TESTConnectionString %>" 
        SelectCommand="SELECT DISTINCT [Genre] FROM [Music] WHERE ([Genre] IS NOT NULL)">
    </asp:SqlDataSource>
    </form>