1.You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.

　　You create a Web form in the application by using the following code fragment. (Line numbers are included for reference only.)

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　　07

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　　09 runat="server" />

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　　12 UpdateMode="Conditional" runat="server">

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　　16 Text="Submit" OnClick="Button_Handler" />

　　17

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　　You plan to create a client-side script code by using ASP.NET AJAX.

　　You need to ensure that while a request is being processed, any subsequent Click events on the btnSubm ..........