Multiple calls made to asmx/js from asp.net Ajax application

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Hi,

I am working on performance tuning of one ASP.NET3.5 and Ajax application. There is a Ajax cascading dropdown list that calls the service - CityListProvider.asmx. When I run the application while the Fiddler tool is capturing the requests/responses, I see that there are multiple calls made for the URL - CityListProvider.asmx/js.

I understand that CityListProvider.asmx/js is called to create the ajax client proxy, but why should there be multiple calls to create the proxy. It's not going to change every other time right? I am sure I am missing something here .. could someone please provide some direction on this.

Thanks,
Ramesh

Posted 9-Feb-11 1:15am

rb.karanam

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Yusuf · Answer 1 · 2011-02-09T10:49:00

It is very hard to say with out looking at the code. Basically you should only see a call to your .asmx when there is an event that triggers a call to you, like selection changes.

Look at this CascadingDropDown page[^] I run it and noticed on Fiddler that the call the respective .asmx was done only when I changed a value in the drop down menu. Compare your page with that and see what is different, may be that will give you a hint.