The .NET Framework has undergone significant changes with each new version, and .NET Framework 4 is no exception. One of the key features introduced in this version is server garbage collection, which provides better performance through background garbage collection for servers.

When using server garbage collection in the .NET Framework 4, you can take advantage of several benefits. For one, it allows for arrays that are larger than 2 gigabytes (GB) on 64-bit platforms, which opens up new possibilities for developers working with large datasets. Additionally, this feature enables better performance by detecting and closing unused objects more efficiently.

Another notable improvement in .NET Framework 4 is the ability to reduce system restarts. This is achieved through a combination of automatic memory management and smart garbage collection algorithms that can detect and close unnecessary objects, reducing the need for system restarts.

In addition to these performance enhancements, .NET Framework 4 also includes several other features and improvements. For instance, it supports the use of Portable Class Libraries (PCLs), which enable developers to create managed assemblies that work on multiple platforms, including Windows Phone, iOS, Android, and more.

A PCL is a project type in Visual Studio 2012 that allows you to write code that can run on multiple platforms with minimal modifications. This is achieved through the use of a common set of types and members that are available across all supported platforms. By using a PCL, developers can create apps that take advantage of the unique features of each platform without having to rewrite their code.

The .NET Framework 4 also includes support for building Metro style apps for Windows using C# or Visual Basic. Metro style apps are designed specifically for use on Windows devices and leverage the power of the operating system to provide a rich, immersive experience for users. To build Metro style apps with .NET Framework 4.5, you'll need to create a new project in Visual Studio and target the 'Windows' platform.

In summary, .NET Framework 4 represents a significant step forward in terms of performance, functionality, and flexibility. With its improved server garbage collection, larger array support, reduced system restarts, and support for PCLs and Metro style apps, this version of the framework offers developers a wide range of tools and features to help them build fast, efficient, and highly effective applications.

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