Click here to Skip to main content
11,642,216 members (59,451 online)
Rate this: bad
Please Sign up or sign in to vote.
See more: C# ASP.NET

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

Rate this: bad
Please Sign up or sign in to vote.

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.
Smile | :)
Big Grin | :-D

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

  Print Answers RSS
0 DamithSL 245
1 Afzaal Ahmad Zeeshan 170
2 Sergey Alexandrovich Kryukov 159
3 OriginalGriff 110
4 Mika Wendelius 90
0 Mika Wendelius 460
1 DamithSL 353
2 OriginalGriff 315
3 Sergey Alexandrovich Kryukov 179
4 Afzaal Ahmad Zeeshan 169

Advertise | Privacy | Mobile
Web01 | 2.8.150731.1 | Last Updated 1 Jan 2013
Copyright © CodeProject, 1999-2015
All Rights Reserved. Terms of Service
Layout: fixed | fluid

CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100