asp.net qr code USING SERVER CONTROLS IN ASP.NET AJAX in Visual C#.NET

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CHAPTER 6 USING SERVER CONTROLS IN ASP.NET AJAX
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Figure 6-11. Design-time tool for configuring the ObjectDataSource control
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This tool includes support for defining SELECT, INSERT, UPDATE, and DELETE operations on the selected data source. Each tab enables you to specify which method in the underlying Data Access Component (DAC) class to invoke to perform a data-access operation. For example, the SELECT tab here is linked to the GetTasksByStatus method in the DAC class. This particular method receives a boolean parameter to indicate whether you want to find the completed tasks or the active tasks. The ObjectDataSource control invokes this method automatically when it needs to get task data from the database; you ll see how it supplies the parameter (i.e., the IsComplete boolean parameter in this example) shortly. You have probably also noticed that there is an .xsd file in the App_Code folder of this site. This also can be (and often is) generated with the help of the aforementioned design-time tool of the ObjectDataSource control. The actual SQL code for the various operations, such as SELECT and UPDATE, reside here. Part of this code is shown in Figure 6-12.
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CHAPTER 6 USING SERVER CONTROLS IN ASP.NET AJAX
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Figure 6-12. TaskDataSet.xsd containing the SQL code for the main operations
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Once again, you can enter most of the query information and/or other configuration data using a graphical interface by viewing the TaskDataSet.xsd file in design mode as shown in Figure 6-13.
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Figure 6-13. TaskDataSet.xsd in design mode
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CHAPTER 6 USING SERVER CONTROLS IN ASP.NET AJAX
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Whether done manually or by using this tool, the end result for the ObjectDataSource control is the script code generated in the .aspx page as you can see in the following code snippet:
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<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" DeleteMethod= "Delete" InsertMethod="Insert" OldValuesParameterFormatString="original_{0}" SelectMethod="GetTasksByStatus" TypeName="TaskDataSetTableAdapters.TasksTableAdapter" UpdateMethod="Update" OnUpdating="ObjectDataSource1_Updating"> <DeleteParameters> <asp:Parameter Name="Original_TaskId" Type="Int32" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="Name" Type="String" /> <asp:Parameter Name="Complete" Type="Boolean" /> <asp:Parameter Name="Original_TaskId" Type="Int32" /> </UpdateParameters> <SelectParameters> <asp:ControlParameter ControlID="DropDownList1" Name="IsComplete" PropertyName="SelectedValue" Type="Boolean" /> </SelectParameters> <InsertParameters> <asp:Parameter Name="Name" Type="String" /> <asp:Parameter Name="Complete" Type="Boolean" /> </InsertParameters> </asp:ObjectDataSource>
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The parameters are clearly defined by their intended operations (e.g., InsertParameters, UpdateParameters, etc.). The SQL operation method name attributes are equally well defined with names such as SelectMethod and UpdateMethod. The ObjectDataSource is a great control for small web applications but may not always be so ideal for larger and more sophisticated apps that need logical and physical separation of the data tier that has complex data objects and a data access layer.
Summary
The ToDo List application is an excellent example of an ASP.NET application and how it can be enhanced with AJAX functionality using ASP.NET AJAX server controls. The server control set you saw in the previous chapter has been carefully designed and implemented to allow you to enhance existing applications as easily as possible and in a manner that involves touching your existing code as little as possible. Additionally, for new applications, it involves reusing your existing skills in ASP.NET and lowers the learning curve drastically.
CHAPTER
Using the ASP.NET AJAX Control Toolkit (Part 1)
y now, you are quite familiar with the ASP.NET AJAX server controls and have seen many examples of their use. The first release version of ASP.NET AJAX also shipped with a set of controls packed under the ASP.NET AJAX Toolkit moniker. These are open source control extensions that have been created by Microsoft as well as the broader community. This package is readily available at http://ajax.asp.net along with documentation and instructional videos. You can also obtain the latest source code at CodePlex (http://codeplex.com), Microsoft s open source project depository. Either way, you have the option to download just the binaries or the full source code. You will find the ASP .NET AJAX Control Toolkit extremely useful because it contains some very rich UI functionality ideal for AJAX-enabled Web 2.0 sites. And the best part is that these controls are just as easy as other server controls to use. You don t have to write any custom JavaScript to add effects to your page. The controls in this toolkit are also often referred to as control extenders because they rely on existing ASP .NET server controls and augment them with built-in client-side JavaScript code to provide impressive effects. You can also easily create your own custom extensions because this toolkit also comes with Visual Studio templates to assist you. At the time of this writing, there are about 40 controls (there will most likely be even more controls due to community contributions by the time you read this), which we will cover in this and the next chapter. As you work through this chapter and the next, you ll learn more about the structure of these control extenders and how they complement the existing ASP.NET server controls. You will also see by example, going through most of the controls this toolkit offers and finding out how to use them in your applications. The examples in this chapter only cover the basics of this toolkit and, in some cases (such as the animation control), there is much functionality that is beyond the scope of this chapter.
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