Listbox is taking so much time on selectedIndexchange event

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I have one listbox which is containing more than 65000 items. In selectedindexchanged event, I clear one textbox and assign selected item value from listbox in textbox. when event fires, this two process done quickly but after that loading is going on and on. I am wondering which process might be going on in background after selectedindexchanged event. After a very long time, textbox shows the selected value from listbox. FYI these two controls (listbox and textbox) are in ajax updatepanel. Can you please help me find the reason why it is taking so much time after executing selectedindexchanged event?

Posted 7-Aug-14 1:02am

Priyanka_L

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[no name] 7-Aug-14 7:22am

Does this same thing happen if you have a more reasonable amount of items in your listbox?

Priyanka_L 7-Aug-14 7:40am

we have items around 2000 or <=2000, then it working as expected. It doesn't take time in loading textbox.

[no name] 7-Aug-14 7:47am

Okay then I would review your design and rework things so that you show your users a reasonable number of items. 2000 items in a listbox is still way too many.

Priyanka_L 7-Aug-14 7:52am

yaa, 2000 is too much but it's users' requirement only. Thanks a lot for the response though.

Richard MacCutchan 7-Aug-14 7:38am

65,000 items? Do you really expect your users to scroll through all of that to find the item they are looking for?

Priyanka_L 7-Aug-14 7:42am

Now we have reduced items to 2000 i.e. we are taking only top 2000 items in listbox as upto that much amount functionality is working fine. But I am posting this question, because I am curious to know the background process and the reason why it is taking so much time.

Richard MacCutchan 7-Aug-14 8:06am

Have you heard about "the laws of physics"?

Any application that is presenting lists to the user should ensure that the number of items is always the minimum required. Make it longer and you will have performance issues as you see. And 2,000 is still far too many.

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jacobjohn196 · Answer 1 · 2014-08-07T02:08:00

Solution 1

Hi,
You could try an ajax autocomplete textbox instead of listbox.
Have a look at this.
AutoComplete With DataBase and AjaxControlToolkit[^]
:-)

Posted 7-Aug-14 2:08am

jacobjohn196