How to prevent autopostback

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I am using two dropdown controls in my .net application. the data for the second dropdown is loaded based on the first dropdown selection. Currently i am using the autopostback property but this will refresh the complete page.I want to prevent the postback but when i use an update panel, for some reason the other functionality where i am copying a file to the server is not working. Is there any other way that i can prevent the postback without using update panel? or is there any telerik control that i can use?

Posted 24-Nov-14 3:49am

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Kornfeld Eliyahu Peter 24-Nov-14 9:56am

Partial page refresh...AJAX...

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syed shanu · Answer 1 · 2014-11-24T13:25:00

As you have mentioned that you are using the Telerik Controls.
You can use "RadAjaxManager1" to prevent your postback .
In your page load you can use the below code.

C#

 ScriptManager _scriptMan = ScriptManager.GetCurrent(this);
        _scriptMan.AsyncPostBackTimeout = 36000;
 RadAjaxManager1.AjaxSettings.AddAjaxSetting(Combobox1, Combobox2);

// here you can see in my page load i will add all the controls which have events to avoid the postback.
// For example here you can see i have used the Radgrid to avoid postback during sorting,paging and etc.
       RadAjaxManager1.AjaxSettings.AddAjaxSetting(RadGrid1, RadGrid1);
        RadAjaxManager1.AjaxSettings.AddAjaxSetting(btnSearch, RadGrid1);

        RadAjaxManager1.AjaxSettings.AddAjaxSetting(cmdPlant, cmdCarCd);
        RadAjaxManager1.AjaxSettings.AddAjaxSetting(txtCustCD, cmdCarCd);
        RadAjaxManager1.AjaxSettings.AddAjaxSetting(btnCustCD, cmdCarCd);

You can find more details from telerik Web site
http://www.telerik.com/help/aspnet-ajax/ajax-ajaxmanager.html[^]