Nesting UpdatePanel controls in .NET framework

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Listing 6.15 Nesting UpdatePanel controls
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<asp:ScriptManager ID="ScriptManager1" runat="server" /> <div style="border: 1px dashed gray;"> <asp:UpdatePanel ID="upd1" runat="server" Outer panel set to UpdateMode="Conditional"> conditional update <ContentTemplate> <div> Last updated on: <%= DateTime.Now.ToLongTimeString() %>   <asp:Button ID="bntOuter" Text="Outer" runat="server" /> </div> <div> <asp:UpdatePanel ID="upd2" runat="server" UpdateMode="Conditional"> <ContentTemplate>    Last Updated on: <%= DateTime.Now.ToLongTimeString() %>  <asp:Button ID="btnInner" Text="Inner" runat="server" /> </ContentTemplate> </asp:UpdatePanel> </div> </ContentTemplate> </asp:UpdatePanel> </div>
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In this example, the outer UpdatePanel is appropriately set to conditionally update. If the UpdateMode property were set to Always instead, there would be no need for the nested panel, because any updates to the inner panel would also invoke an update to the outer panel. Take a moment to run the sample and experiment with setting the outer panel UpdateMode property to Always and back to Conditional.
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You should have an overall sense of how the UpdatePanel is used. The examples you ve worked through so far demonstrated the simplest cases for each property and method the UpdatePanel offers. Now that you ve established this foundation, let s have some fun by putting together something a little more useful: a GridView that you can sort, page, and filter without normal postbacks (page refreshes).
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In ASP.NET 2.0, the GridView is the successor to the frequently used DataGrid control in ASP.NET 1.1. The GridView is powerful because it comes with built-in support for paging, sorting, and editing. But with this feature comes a cost each of these functions performs a postback to the server. Every time the user sorts a column or pages through results, he loses his connection with the application as he s left waiting for it to be processed. The first objective is obviously to stop the page from refreshing each time the user interacts with it. As you can guess, the solution is trivial with the UpdatePanel. But what makes this application unique is that it also allows the user to filter the results of a selected column. This brings us to the second goal. Currently, a user can filter a column in the GridView by entering text and clicking the Filter button on the form. Instead of requiring the user to click the Filter button, let s make the application more responsive by countering the user s keystrokes with on-the-fly filtering. In other words, you ll bring the GridView filtering to life by making it more intuitive and receptive to user actions instead of requiring them to click the Filter button. Let s look at the application. Figure 6.7 shows the site in its initial state before any filter has been applied.
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Figure 6.7 The GridView in its initial state shows the contents of the Contact table in the AdventureWorks database.
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Figure 6.8 After the user enters text and clicks the Filter button, the contents of the selected column are filtered and updated.
If the user enters in some criteria and then clicks the button to invoke the filter, the column that is currently used for sorting (FirstName by default) is updated with the filtered results. Figure 6.8 illustrates this effect. To effectively relay back to the user the results from the filter, the matched text found in the column is highlighted (a nice touch). Consequently, each update to the text box and button click display new filtered results. Before you begin integrating the UpdatePanel and enhancing the filter behavior, you should understand how the current application works so you can assess what changes need to be made.
How does the GridView filter work
Understanding how the current application works will assist you in deciding what steps to take next. A good starting point is to take inventory of the elements (or controls) on the page and how they re configured.
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