Solution to SYS undefined errors when ASP. NET uses Ajax controls

To solve this problem, try the following two methods:

1. Add the following content to the system. Web node in the web. config file:

<Httphandlers>
<! -- <Add verb = "post, get" Path = "ajax/*. ashx" type = "Ajax. pagehandlerfactory, Ajax"/> -->
<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 = "*" Path = "* _ appservice. axd "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>

 

2. Add the following content to Web. config:

<Httphandlers>

          <Add verb = "get" Path = "scriptresource. axd" type = "Microsoft. Web. Handlers. scriptresourcehandler" 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>