How to configure my ASP.NET application to use .NET 3.5

Posted on 2008-10-27
Last Modified: 2013-11-08
Hi, many say that .Net 3.5 is just an extention for version 2 so there is no need to configure the appliction to use 3.5 after I recently updated my .NET framework from version 2 to 3.5 and also installed .NET 3.5 service pack1.
After I installed .Net 3.5 I supposed our application will use 3.5 by default but when I add a property EnableHistory="true" (which supported by .NET 3.5 only) to the scriptmanager tag I got a runtime error says: "Type 'System.Web.UI.ScriptManager' does not have a public property named 'EnableHistory'" which means that I'm not using .NET 3.5!
Whhat I missed? Any suggestion?
Question by:Abdu_Allah
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
LVL 20

Expert Comment

ID: 22816989
If you right-click on the root of the app in the solution explorer (in Visual Studio) you should be able to set the target framework.

Author Comment

ID: 22817105
Where exactly?
By the way I'm using VS 2005
LVL 20

Accepted Solution

brwwiggins earned 500 total points
ID: 22817351
oh, the version 3.5 is not compatible with VS 2005. The compilers do not understand the language.
Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

LVL 26

Expert Comment

by:Anurag Thakur
ID: 22819131
did you install ajax extension library for .net version 3.5 or you still running for version 2.0
download and upgrade from and try again

Author Comment

ID: 22819958
>oh, the version 3.5 is not compatible with VS 2005. The compilers do not understand the language.
Really! I tried to find a link supports that but could'nt, do you have one?

Author Comment

ID: 22820011
raji007, in that link the first statment is:
"AJAX functionality is integrated in ASP.NET 3.5 SP1 and does not require any additional downloads."

Featured Post

Stack Overflow Podcast - Frustrating Miracles

In this podcast, Stack Overflow interviewed Linux Academy CEO/Founder, Anthony James, and got his developer story!

"Follow your passion, be prepared to work hard and sacrifice, and, above all, don't let anyone limit your dreams."  - Donovan Bailey

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article shows how to use the open source plupload control to upload multiple images. The images are resized on the client side before uploading and the upload is done in chunks. Background I had to provide a way for user…
Problem Hi all,    While many today have fast Internet connection, there are many still who do not, or are connecting through devices with a slower connect, so light web pages and fast load times are still popular.    If your ASP.NET page …
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

622 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question