.NET Framework 3.5: Installing on Windows 10

Windows 10 comes with .NET Framework 4.5 pre-installed, but many applications developed back in the days of Vista and Windows 7 need .NET Framework v3.5. These applications won't work until you install the required version. After you try to launch such a program, Windows 10 will offer to download and install .NET Framework 3.5 for you.

What is Framework 3.5

Framework 3.5, or .NET Framework 3.5 – a version of Microsoft's development platform that gives developers a set of libraries and tools for creating applications in the C#, VB.NET and other .NET programming languages. This version was released in 2007 and includes several key components:

• LINQ (Language Integrated Query): lets developers write data queries directly in code, using syntax integrated into the programming language.
• ASP.NET AJAX: provides the ability to create interactive web applications using asynchronous calls to server-side code.
• Extensibility features: .NET Framework 3.5 supports creating custom controllers and libraries

Step-by-step installation through the Control Panel

1. Open the Control Panel

2. Switch to the "Small icons" view

3. Find and open "Programs and Features"
   

   

   Programs and Features

4. Click "Turn Windows features on or off"
   

   

   The Windows Features window

5. Select .NET Framework 3.5 (including 2.0 and 3.0) and click the "OK" button
   

   

   .NET Framework 3.5

6. Wait while Windows downloads and installs the required components

Installation through DISM

There's one more way to enable .Net Framework - to use DISM. Mount the Windows 10 disc image or insert a DVD, or insert a bootable USB stick with the operating system.

Now open a command prompt with elevated administrator rights and enter the following command:

Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:sourcessxs /LimitAccess

Replace D: with the drive letter of your Windows 10 installation media.

The offline installer for .NET Framework 3.5

The offline .NET Framework installer – a small utility, available for free, developed by TechGainer for automatically installing .NET Framework 3.5 on Windows 10. Although .NET Framework 4 is part of Windows 8 and 10, version 3.5 and earlier versions are not included in these Windows editions. To install them, you need an internet connection. You can install it using the internet.

![The Windows Features window] [image-4.png]

How to uninstall?

To uninstall .NET Framework 3.5 from Windows 10, follow these steps:

1. Open the Control Panel: press the Windows key and type "Control Panel"
2. Go to 'Programs and Features'
3. Click "Turn Windows features on or off"
4. Find .NET Framework 3.5: in the window that opens, find the .NET Framework 3.5 item (includes .NET 2.0 and 3.0)
5. Untick the box and click OK

WARNING

Note: some applications may require .NET Framework 3.5 to work correctly, so make sure you have no dependencies on this version before uninstalling.

Additional resources

• Microsoft's official documentation
• Microsoft Download Center

INFO

If you have questions about installing .NET Framework 3.5 or about other F3 Cloud services, contact our support team.

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