ASPNET 2.0 AJAX Microsoft JScript runtime error: 'sys 'undefined Solution

When we use AJax in. net2.0, it may not work, but it will still be refreshed,

Microsoft JScript runtime error will also be prompted: 'sys 'the error of the undefined solution can be solved using the following method:

The solution is to add the following code to the last section of the <system. web> node in the webconfig of the project:

<HttpHandlers>
<Remove verb = "*" path = "*. asmx"/>
<Add verb = "*" path = "*. asmx "validate =" false "type =" System. web. script. services. scriptHandlerFactory, System. web. extensions, Version = 1.0.61025.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35 "/>
<Add verb = "GET, HEAD" path = "ScriptResource. axd "type =" System. web. handlers. scriptResourceHandler, System. web. extensions, Version = 1.0.61025.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35 "validate =" false "/>

</HttpHandlers>

<HttpModules>
<Add name = "ScriptModule" type = "System. Web. Handlers. ScriptModule, System. Web. Extensions, Version = 1.0.61025.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35"/>

</HttpModules>