HttpContext and AutoComplete Extender

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HttpContext and AutoComplete Extender

I am using AutoComplete Extender from Ajax control tool kit. I have a webservice that this extender uses. In the web method I need to access a value "empid" which is present in my aspx page. I placed this value in HttpContext's Items collection in my aspx page.

HttpContext.Items["empid"]=;

In the web method I am trying to access the same using

string s=Context.Items["empid"];

But Items collection does not have any item there. Is this due to the partial postback the autocomplete extender control is doing.

Can some one help?

The AutoComplete Extender uses a web method with a specific signature (explained in the documentation) on a web service. This will be called from the browser using JavaScript (behind the scenes).

The web service and its web method know nothing about your page - they only know the information that is passed to them in the arguments of the web method.

Richard Ev 2009-02-11 17:45:03

Thanks Richard for the response. However I still have a doubt. I am able to access the Cache object in this web method. I am using it as belowContext.Cache["key"]. And I am curious to know how this works then?

2009-02-12 12:26:49

Calling Context.Cache["key"] will simply return null if no item called "key" exists, so I think that's what you're seeing.

Richard Ev 2009-02-12 15:22:31

No Richard I am getting proper values in Context.Cache["key"]. Actually I added Cache["somekey"]=value and HttpContext.Items["empid"]=value during page_init event. I am getting proper values when I access Context.Cache in web method but when I try accessing Items I dont get them.

2009-02-13 06:15:30

I don't understand what you mean Deepa - however from a design point of view I would say that the web method should not rely on data in your cache, unless it put the data there itself.

Richard Ev 2009-02-16 08:58:08

Here's my design. The autocomplete extender is using a web method. This web method is searching strings from a cache object which is already populated. Please share your thoughts on this.

2009-02-17 12:03:29

Also coming to my doubt now, you said the web method know nothing about my page which is why it does not know Context.items["key"] and which is why I get null in web method. However i observed that it knows Context.Cache["key"] and give me proper value there but not for Context.Items[] .Thoughts?

2009-02-17 12:05:32

What are you caching, and why? If you are caching for performance reasons, have you proven that you actually have a performance issue and that it is resolved by caching?

Richard Ev 2009-02-17 13:59:25

Yes that's right we have performance issues and which is why we are caching.

2009-02-18 10:38:08

I think you need to store your cached data in your database in a rapid-to-query form, and access it from your web service call. I'm assuming that you have a database query that is your bottleneck...

Richard Ev 2009-02-18 11:30:17

ansaurus

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