Difference between .Net 4.0 and .Net 3.5, 2.0

Difference between .Net 4.0 and .Net 3.5, 2.0: "

.Net Framework 4.0 comes up with some of major changes as compare to previous versions of .Net Framework 3.5 and 2.0



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 

Link to find details of all the Major changes in .Net 4.0

From http://dotnetguts.blogspot.com

"