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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

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 at 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.

1 solution

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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.

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