Update a Dropdownlist

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I have two drop down lists on my asp.net page, the second of which needs to be filled in based on the selection in the first dropdownlist. It's work fine when I set Autopostback="true". The catch
however, is that it must occur without a postback/pageload.

Does anyone have a way to accomplish this? I have found many solution by googling, but I don't understand them. I am not very good at asp.net. Please give me the simple code if you have.

Thanks in advance, your help is greatly appreciated.

Sazzad

Posted 4-Dec-13 5:08am

sazzad37

Updated 4-Dec-13 5:10am

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Karthik_Mahalingam · Accepted Answer · 2013-12-04T05:20:00

Solution 1

Add ajax update panel in your page and put drop down list controls in it..

use this link as reference.

http://www.c-sharpcorner.com/Forums/Thread/199983/cascading-dropdownlist-using-updatepanel.aspx[^]

Posted 4-Dec-13 5:20am

Karthik_Mahalingam

AlexDpars · Accepted Answer · 2013-12-04T05:34:00

You may use Update Panels to acheive this or use JQuery. Jquery will completely avoid postback action by making a javascript call to the server when update panel will postback only what is inside of the update panel and will avoid a complete postback (and also the pageload).

However if your goal is to avoid some actions in your pageload event I would suggest you to use IsPostback property wich will be set to true when the server call comes from a postback.