Web user Control post back issue

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Hi,

I am creating a web user control which contains DropDown and TreeView if change the dropdown value the node is selected in tree control.

Page contains <cc1:scriptmanager xmlns:cc1="#unknown">

and web control use <asp:ToolkitScriptManager >

I got the error "Only one instance of a ScriptManager can be added to the page"

if I remove <asp:ToolkitScriptManager >from web user control then page is post back.

How can i stop the post back when change the dropdown value in web user control?

Posted 31-Dec-12 23:20pm

saad.raza

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saad.raza 1-Jan-13 5:43am

hi Prashant if I remove the script manager from user control then it post back the page. I am using ajax in control to just stop the postback on page level.

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prashant patil 4987 · Accepted Answer · 2012-12-31T23:28:00

Solution 1

hey saad,

This issue is occure because of when you add two script manager into same page.
Try to check that script manager should be once only. per page.

do one thing, remove script manager from User control. then error will fix.

Happy Coding.
happy New Year.
:)
:D

Posted 31-Dec-12 23:28pm

prashant patil 4987