diff between framework 3.5 and framework 4.0?

Hi..

Few other points are as below:

Main Differences between ASP.NET 3.5 and ASP.NET 4.0.

ASP.NET 3.5 is having the following main features which are not availablle in the prior releases

1) AJAX integration
2) LINQ
3) Automatic Properties
4) Lambda expressions

I hope it would be useful for everyone to know about the differences about asp.net 3.5 and its next version asp.net 4.0

Because of space consumption I'll list only some of them here.

1) Client Data access:


ASP.NET 3.5: There is no direct method to access data from client side. We can go for any of these methods

1) Pagemethods of script manager
2) ICallbackEventHandler interface
3) XMLHttphanlder component

ASP.NET 4.0: In this framework there is an inbuilt feature for this. Following are the methods to implement them.

1) Client data controls
2) Client templates
3) Client data context

i.e we can access the data through client data view & data context objects from client side.

2) Setting Meta keyword and Meta description:


Meta keywords and description are really useful for getting listed in search engine.

ASP.NET 3.5: It has a feature to add meta as following tag







ASP.NET 4.0: Here we can add the keywords and description in Page directives itself as shown below.


< %@ Page Language="C#" CodeFile="Default.aspx.cs"
Inherits="_Default"
Keywords="Keyword1,Key2,Key3,etc"
Description="description" %>



3) Enableviewstage property for each control

ASP.NET 3.5: this property has two values "True" or "false"

ASP.NET 4.0: ViewStateMode property takes an enumeration that has three values: Enabled, Disabled, and Inherit.
Here inherit is the default value for child controls of a control.

4) Setting Client IDs
Some times ClientID property creates head ach for the programmers.

ASP.NET 3.5: We have to use ClientID property to find out the id which is dynamically generated

ASP.NET 4.0: The new ClientIDMode property is introduced to minimize the issues of earlier versions of ASP.NET.

It has following values.

AutoID - Same as ASP.NET 3.5
Static - There won't be any separate clientid generated at run time
Predictable-These are used particularly in datacontrols. Format is like clientIDrowsuffix with the clientid vlaue
Inherit- This value specifies that a control's ID generation is the same as its parent.

Hi...
Is this what you are looking for??
Following are list of Major Changes in .Net 4.0

• ControlRenderingCompatabilityVersion Setting in the Web.config File 
• ClientIDMode Changes 
• HtmlEncode and UrlEncode Now Encode Single Quotation Marks 
• ASP.NET Page (.aspx) Parser is Stricter 
• Browser Definition Files Updated 
• System.Web.Mobile.dll Removed from Root Web Configuration File 
• ASP.NET Request Validation 
• Default Hashing Algorithm Is Now HMACSHA256 
• Configuration Errors Related to New ASP.NET 4 Root Configuration 
• ASP.NET 4 Child Applications Fail to Start When Under ASP.NET 2.0 or ASP.NET 3.5 Applications 
• ASP.NET 4 Web Sites Fail to Start on Computers Where SharePoint Is Installed 
• The HttpRequest.FilePath Property No Longer Includes PathInfo Values 
• ASP.NET 2.0 Applications Might Generate HttpException Errors that Reference eurl.axd 
• Event Handlers Might Not Be Not Raised in a Default Document in IIS 7 or IIS 7.5 Integrated Mode Changes to the ASP.NET Code Access Security (CAS) Implementation 
• MembershipUser and Other Types in the System.Web.Security Namespace Have Been Moved 
• Output Caching Changes to Vary * HTTP Header 
• System.Web.Security Types for Passport are Obsolete 
• The MenuItem.PopOutImageUrl Property Fails to Render an Image in ASP.NET 4 
• Menu.StaticPopOutImageUrl and Menu.DynamicPopOutImageUrl Fail to Render Images When Paths Contain Backslashes
  

Check this link for a list, and brief discussion, of new features added in .NET Framework 4.0.

As 3.5 was the previous version this list represents the difference between the two:

http://msdn.microsoft.com/en-us/library/vstudio/ms171868(v=vs.100).aspx