how to run sql query with callback in asp.net?

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how to run sql query with callback in asp.net?

i want to load from sql and then after select 'province' dropdownlist filter 'city' dropdownlist ?

Posted 2-Jan-13 1:21am

davoodta

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Orcun Iyigun 2-Jan-13 7:27am

I think you can run your query from "SelectedIndexChanged" event of your dropdownlist if I understand your question properly. Are you trying to accomplish a cascading dropdown?

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Zafar Sultan · Answer 1 · 2013-01-02T01:29:00

In the context of ASP.Net the question you have posted is a very basic question because as a web developer using ASP.Net to create dynamic applications, this type of functionality is the first to be aware of. You may search "DataBinding in ASP.Net using C#" on google to get a start. I would also suggest to get a good book on ASP.Net and start as soon as possible. Start writing some code and the moment you are stuck with something in your code we all are here to solve it. But, to expect that we willl spoon feed you with solutions is a waste of time. I am sorry if I have said something objectionable.

davoodta · Answer 2 · 2013-01-02T01:30:00

Solution 2

when use SelectedIndexChanged is postback run!

Posted 2-Jan-13 1:30am

davoodta

**Zoltán Zörgő** · Answer 3 · 2013-01-02T01:35:00

Solution 3

Not the callback is the keyword you are looking for, you need Cascading Dropdown.
Look here: http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/CascadingDropDown/CascadingDropDown.aspx[^]

Posted 2-Jan-13 1:35am

Zoltán Zörgő