I had this issue where I wanted more than one row of headers in the TabContainer as I had a large number of panels and was not able to fit them in the page.

Here is the solution. [make sure you download the toolkit with source]

Open the AJAX Control Toolkit's solution by clicking on the solution file inside the toolkit folder.  

Open the file Tabs.css under AjaxControlToolkit/Tabs/Tabs.css

And make the following changes.

/* default layout */.ajax__tab_default .ajax__tab_header {}

.ajax__tab_default .ajax__tab_outer {display:-moz-inline-box;display:inline-block}

.ajax__tab_default .ajax__tab_inner {display:-moz-inline-box;display:inline-block}

.ajax__tab_default .ajax__tab_tab {margin-right:4px;overflow:hidden;text-align:center;cursor:pointer;display:-moz-inline-box;display:inline-block}

Now click on Build -> Build Solution to build the solution.

Use the AjaxControlToolkit.dll under ToolkitTests/Bin folder as your reference from now on.

Add this dll file as reference to your current website and you should have the 2 rows.

I have been going through the ASP.net forums and many people have had issues with GridViews especially the situation where the user wants to group each row by a particular condition.

There are controls available in the market which solve the issue (only sad part is we need to buy them).

I have used up 2 GridViews and AJAX Control Toolkit's accordion to achieve the required result. I have not done any back-end code, so this enables even a novice developer to create this page. Also I am using the NorthWind database provided by Microsoft.

Working Link

Download the source-code

Screenshot:

Code:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="CategoryID"                

DataSourceID="getCategories">                

<Columns>                    

<asp:TemplateField HeaderText="CategoryName" SortExpression="CategoryName">                        

<ItemTemplate>                            

<asp:Label Visible="false" ID="labelCategoryID" runat="server" Text='<%# Bind("CategoryID") %>'></asp:Label>                           

<cc1:Accordion ID="MyAccordion" runat="server" SelectedIndex="-1" HeaderCssClass="accordionHeader"                                

ContentCssClass="accordionContent" FadeTransitions="true" FramesPerSecond="30"                                

TransitionDuration="250" Width="500px" AutoSize="None" RequireOpenedPane="false"                                

SuppressHeaderPostbacks="true">                                

<Panes>                                    

<cc1:AccordionPane ID="pane1" runat="server">                                        

<Header>                                            

<asp:DataList ID="DataList2" runat="server" DataSourceID="getNamefromID">                                                

<ItemTemplate>                                                    

<asp:HyperLink NavigateUrl="~/Default.aspx" runat="server" Text='<%# Eval("CategoryName") %>'></asp:HyperLink>                                                

</ItemTemplate>                                           

</asp:DataList>                                        

</Header>                                        

<Content>                                            

<asp:GridView CellPadding="4" ForeColor="#333333" GridLines="None" ID="GridView2"                                                

runat="server" AutoGenerateColumns="False" DataKeyNames="ProductID" DataSourceID="getProducts">                                                

<FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />                                                

<RowStyle BackColor="#E3EAEB" />                                                

<PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />                                                

<SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />                                                

<HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />                                                

<EditRowStyle BackColor="#7C6F57" />                                                

<AlternatingRowStyle BackColor="White" />                                                

<Columns>                                                    

<asp:BoundField DataField="ProductID" HeaderText="ProductID" InsertVisible="False"                                                        

ReadOnly="True" SortExpression="ProductID" />                                                    

<asp:BoundField DataField="ProductName" HeaderText="ProductName" SortExpression="ProductName" />                                                    

<asp:BoundField DataField="SupplierID" HeaderText="SupplierID" SortExpression="SupplierID" />                                                    

<asp:BoundField DataField="QuantityPerUnit" HeaderText="QuantityPerUnit" SortExpression="QuantityPerUnit" />                                                

</Columns>                                            

</asp:GridView>                                        

</Content>                                    

</cc1:AccordionPane>                                

</Panes>                            

</cc1:Accordion>                            

<asp:AccessDataSource ID="getNamefromID" runat="server" DataFile="~/App_Data/Nwind.mdb"                                

SelectCommand="SELECT [CategoryName],[CategoryID] FROM [Categories] WHERE ([CategoryID] = ?)">                                

<SelectParameters>                                    

<asp:ControlParameter ControlID="labelCategoryID" Name="CategoryID" PropertyName="Text"                                       

 Type="Int32" />                                

</SelectParameters>                            

</asp:AccessDataSource>                            

<asp:AccessDataSource ID="getProducts" runat="server" DataFile="~/App_Data/Nwind.mdb"                                

SelectCommand="SELECT [ProductID], [ProductName], [SupplierID], [QuantityPerUnit] FROM [Products] WHERE ([CategoryID] = ?)">                                

<SelectParameters>                                    

<asp:ControlParameter ControlID="labelCategoryID" Name="CategoryID" PropertyName="Text"                                        

Type="Int32" />                                

</SelectParameters>                            

</asp:AccessDataSource>                        

</ItemTemplate>                    

</asp:TemplateField>                

</Columns>            

</asp:GridView>            

<asp:AccessDataSource ID="getCategories" runat="server" DataFile="~/App_Data/Nwind.mdb"                

SelectCommand="SELECT [CategoryName], [CategoryID] FROM [Categories]"></asp:AccessDataSource>

I was trying to find a solution which did bulk updating for all the rows in a gridview, as the gridview provided by VS2005 had its usability issue (at least that's what I thought). After doing some googling I found a set of different grid views available at codeplex called 'ASP.NET Real World Controls'.

Its got a BulkEditGridView, FrozenGridView, GroupingGridView, InlineInsertGridView and TwoHeadedGridView. You can get a hold of the .dll file from http://www.codeplex.com/ASPNetRealWorldContr.
Here is an example of bulk edit grid view.

<cc1:BulkEditGridView ID="BulkEditGridView1" runat="server" AutoGenerateColumns="False"            

DataKeyNames="CategoryID" DataSourceID="AccessDataSource1" EnableInsert="False"            

InsertRowCount="1" SaveButtonID="Button1" AllowPaging="True" BackColor="LightGoldenrodYellow" BorderColor="Tan" BorderWidth="1px" CellPadding="2" ForeColor="Black" GridLines="None" Width="502px"><Columns>

<asp:BoundField ReadOnly="True" DataField="CategoryID" InsertVisible="False" SortExpression="CategoryID" HeaderText="CategoryID"></asp:BoundField>

<asp:BoundField DataField="CategoryName" SortExpression="CategoryName" HeaderText="CategoryName"></asp:BoundField>

<asp:BoundField DataField="Description" SortExpression="Description" HeaderText="Description"></asp:BoundField>

</Columns>            

<FooterStyle BackColor="Tan" />            

<SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" />            

<PagerStyle BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue" HorizontalAlign="Center" />            

<HeaderStyle BackColor="Tan" Font-Bold="True" />            

<AlternatingRowStyle BackColor="PaleGoldenrod" /> </cc1:BulkEditGridView>        

<asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/App_Data/Nwind.mdb"            

DeleteCommand="DELETE FROM [Categories] WHERE [CategoryID] = ?" InsertCommand="INSERT INTO [Categories] ([CategoryID], [CategoryName], [Description]) VALUES (?, ?, ?)"             SelectCommand="SELECT [CategoryID], [CategoryName], [Description] FROM [Categories]"            

UpdateCommand="UPDATE [Categories] SET [CategoryName] = ?, [Description] = ? WHERE [CategoryID] = ?">             <DeleteParameters>                 <asp:Parameter Name="CategoryID" Type="Int32" />             </DeleteParameters>            

<UpdateParameters>                 <asp:Parameter Name="CategoryName" Type="String" />                

<asp:Parameter Name="Description" Type="String" />                 <asp:Parameter Name="CategoryID" Type="Int32" />            

 </UpdateParameters>             <InsertParameters>                 <asp:Parameter Name="CategoryID" Type="Int32" />      

           <asp:Parameter Name="CategoryName" Type="String" />                 <asp:Parameter Name="Description" Type="String" />             </InsertParameters>         </asp:AccessDataSource>         <asp:Button ID="Button1" runat="server" Text="Update" Width="200px" />

You just need to make sure that you changed the SaveButtonID property to the button's ID.