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.NET Framework 3.5 was released by Microsoft in November 2007.
It is based on previous versions of the .NET Framework (such as 2.0 and 3.0) and has many new features and improvements added to it.
It was specially created for developers so that they can easily create and manage modern applications.
.NET Framework 3.5 has made coding simpler and more effective for developers by adding new technologies and features compared to older versions.
It is especially used for modern web and desktop applications.

The list below describes the new features of .NET Framework 3.5 in simple language:

1. LINQ (Language Integrated Query):

LINQ is a new technology that provides a uniform syntax for querying data with databases, XML, and in-memory objects.
This makes the code easy to read and write.
Example: With the help of LINQ, you can query data directly in the code using SQL-like syntax.

2. Improvements in WCF (Windows Communication Foundation):

REST (Representational State Transfer) support has been added to WCF, which has made it easier to create and use web services.
Support for JSON (JavaScript Object Notation) format is also available, which is very useful in today's web technologies.

3. Improvements in ASP.NET:

ASP.NET AJAX support: With the help of AJAX, websites can be made faster and more interactive.
Developers can now use AJAX directly, which improves client-side performance.

4. New compiler features (C# and VB.NET):

5. Improvements in WF (Windows Workflow Foundation):

6. New Assemblies:

7. Extensions and support:

Backward compatibility with older .NET Framework versions.
Support for Visual Studio 2008, which makes full use of the capabilities of .NET Framework 3.5.

8. Deployment improvements:

Single installation package, so that all necessary components are installed at once.
Improvements in ClickOnce deployment technology, so that applications can be deployed easily and quickly.

9. Better performance:

10. Other features:

Peer-to-Peer networking: Support for peer-to-peer applications.
Windows CardSpace: For secure identity management.
Improvements in diagnostics and debugging: It has become easier for developers to find and fix bugs in applications.