how to prevent page refresh in asp.net on dropdown list event?

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I am developing my asp.net website, my requirement is to refresh DropDownList2 at SelectedIndexChanged event of DropDownList1, I have set

C#

AutoPostBack="True"

for DropDownList1. Now the problem is whole web page gets refreshed, its unnecessary for me, is there any other technique that i can use to refresh only that control or only that panel rather than refreshing whole page?

Posted 30-Jan-12 23:01pm

PATEL RAJEEV

Updated 30-Jan-12 23:53pm

Anuja Pawar Indore

v2

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saini arun 31-Jan-12 5:07am

If both the drop downs have items at the time of page load, you can do it using javascript.
If the items in the second drop down depends upon the item selected in the first one, then you have to use ajax.

PATEL RAJEEV 31-Jan-12 5:10am

Sorry i don't know how to use ajax.
p/z help me.

saini arun 31-Jan-12 6:16am

See the solution posted by maheshkumar.adarsh below. You just need to place your drop downs in between contentTemplate tags.

Anuja Pawar Indore 31-Jan-12 5:54am

Removed extra pre tag

2 solutions

Solution 2

Write the code between this

XML

<asp:ScriptManager ID="ScriptManager1" runat="server" />
       <asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">

           <ContentTemplate>

           </ContentTemplate>
             <Triggers>
         <asp:Asyncpostbacktrigger controlid="DropDownList2" eventname="SelectedIndexChanged" />
       </Triggers>
       </asp:UpdatePanel>

Posted 30-Jan-12 23:16pm

maheshkumar.adarsh

Updated 30-Jan-12 23:19pm

v2

Comments

Member 10409158 24-Jan-15 9:58am

it doesn't work

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Kanasz Robert · Accepted Answer · 2012-01-30T23:09:00

Solution 1

hi,

try to user UpdatePanel:

http://ajax.net-tutorials.com/controls/updatepanel-control/[^]

http://msdn.microsoft.com/en-us/library/system.web.ui.updatepanel.aspx[^]

http://msdn.microsoft.com/en-us/library/bb399001.aspx[^]

Regards
Robert

Posted 30-Jan-12 23:09pm

Kanasz Robert