.NET Framework 3.5: What You Need to Know
If you are a Windows user, you may have encountered some applications that require .NET Framework 3.5 to run properly. But what is .NET Framework 3.5 and why do you need it? How can you download and install it on your system? And what if you encounter any problems during the installation process? In this article, we will answer all these questions and more, so you can enjoy your favorite apps without any hassle.
.net framework 3.5 (includes .net 2.0 and 3.0) download
Introduction
.NET Framework is a software platform developed by Microsoft that provides a common environment for running various applications and services. It consists of two main components: the common language runtime (CLR) and the .NET Framework class library. The CLR is responsible for managing memory, security, and interoperability between different languages and platforms. The .NET Framework class library is a collection of reusable code that provides functionality for common tasks such as data access, networking, cryptography, user interface, and more.
What is .NET Framework 3.5?
.NET Framework 3.5 is a version of .NET Framework that was released in November 2007. It contains many new features and improvements that build upon .NET Framework 2.0 and 3.0, such as:
LINQ (Language Integrated Query), a set of extensions that enable data querying capabilities across various data sources.
WCF (Windows Communication Foundation), a framework for building service-oriented applications that communicate over various protocols.
WF (Windows Workflow Foundation), a framework for creating workflow-based applications that coordinate human and machine activities.
WPF (Windows Presentation Foundation), a framework for creating rich user interfaces that leverage graphics, animation, media, and documents.
ASP.NET AJAX, a set of technologies that enable interactive web applications with partial page updates and client-side scripting.
Entity Framework, an object-relational mapping (ORM) framework that simplifies data access by abstracting the relational database schema.
ADO.NET Data Services, a framework that exposes data as RESTful web services that can be consumed by various clients.
.NET Framework 3.5 also includes .NET Framework 2.0 service pack 1 and .NET Framework 3.0 service pack 1, which provide bug fixes and security updates for these versions.
Why do you need .NET Framework 3.5?
You may need .NET Framework 3.5 to run an application that was developed using this version or targets this version specifically. Some applications may also require .NET Framework 3.5 for compatibility reasons or to leverage some of its features or libraries. For example, some games may use WPF for their user interface or LINQ for their data processing.
If you try to run an application that requires .NET Framework 3.5, you may see an error message like this:
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Alternatively, you may see a dialog box like this:
In either case, you will need to download and install .NET Framework 3.5 to run the application successfully.
How to check if you have .NET Framework 3.5 installed?
Before you download and install .NET Framework 3.5, you may want to check if you already have it installed on your system. There are several ways to do this, such as:
Using the Registry Editor: You can open the Registry Editor by typing regedit in the Run dialog box (Windows key + R) or the search box on the taskbar. Then, navigate to the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5. If you see this key, it means you have .NET Framework 3.5 installed. You can also check the value of the Version entry to see the exact version number.
Using the Command Prompt: You can open the Command Prompt by typing cmd in the Run dialog box (Windows key + R) or the search box on the taskbar. Then, type the following command: dir %WINDIR%\Microsoft.NET\Framework\v3.5. If you see a list of files and folders, it means you have .NET Framework 3.5 installed.
Using PowerShell: You can open PowerShell by typing powershell in the Run dialog box (Windows key + R) or the search box on the taskbar. Then, type the following command: Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5'. If you see some output, it means you have .NET Framework 3.5 installed.
Using a third-party tool: You can also use a third-party tool such as , which can show you all the versions of .NET Framework installed on your system.
How to download and install .NET Framework 3.5
If you don't have .NET Framework 3.5 installed on your system, or if you need to reinstall it for some reason, there are several ways to do so. Here are some of the most common methods:
Download the offline installer
The offline installer is a standalone package that contains all the files and components needed to install .NET Framework 3.5 on your system. You can download it from . The file size is about 231 MB.
Pros and cons of using the offline installer
The offline installer has some advantages and disadvantages, such as:
You can use it to install .NET Framework 3.5 on multiple computers without downloading it again.
You can use it to install .NET Framework 3.5 without an internet connection.
You can use it to install .NET Framework 3.5 on older versions of Windows that don't support the on-demand installation or the Control Panel method.
You may need to restart your computer after installing .NET Framework 3.5 using the offline installer.
You may need to manually enable some features or components of .NET Framework 3.5 after installing it using the offline installer.
You may encounter some compatibility issues with other software or updates that require a newer version of .NET Framework.
Steps to use the offline installer
To use the offline installer, follow these steps:
Download the offline installer from and save it to a convenient location on your computer.
Double-click the downloaded file to run the installer. You may see a User Account Control prompt asking for your permission. Click Yes to continue.
Follow the instructions on the screen to complete the installation. You may need to accept the license terms and choose a destination folder.
Wait for the installation to finish. You may see a progress bar and some messages indicating the status of the installation.
Restart your computer if prompted. This will ensure that the changes take effect.
Verify that .NET Framework 3.5 is installed on your system by using one of the methods described in the previous section.
Install the .NET Framework 3.5 on demand
The on-demand installation is a feature that allows you to install .NET Framework 3.5 directly from Windows Update without downloading a separate package. This feature is available on Windows 10, Windows 8.1, and Windows Server 2012 R2 or later.
Pros and cons of using the on-demand installation
The on-demand installation has some advantages and disadvantages, such as:
You don't need to download a large file or use any external media to install .NET Framework 3.5.
You can install .NET Framework 3.5 quickly and easily by following a few simple steps.
You can install .NET Framework 3.5 only when you need it, saving disk space and bandwidth.
You need an internet connection to install .NET Framework 3.5 using this method.
You may need to enable some settings or features on your system to allow the on-demand installation to work properly.
You may encounter some errors or issues during the on-demand installation due to network problems or configuration conflicts.
Steps to use the on-demand installation
To use the on-demand installation, follow these steps:
Make sure you have an internet connection and that your system is up to date with the latest Windows updates.
Run the application that requires .NET Framework 3.5. You may see an error message or a dialog box asking you to install .NET Framework 3.5, as shown in the previous section.
Click the Install this feature button or the link to install .NET Framework 3.5. You may see a User Account Control prompt asking for your permission. Click Yes to continue.
Wait for the installation to finish. You may see a progress bar and some messages indicating the status of the installation.
Restart your computer if prompted. This will ensure that the changes take effect.
Verify that .NET Framework 3.5 is installed on your system by using one of the methods described in the previous section.
Enable the .NET Framework 3.5 in Control Panel
The Control Panel method is another way to install .NET Framework 3.5 on your system. This method allows you to enable or disable .NET Framework 3.5 as a Windows feature from the Control Panel. This feature is available on Windows 10, Windows 8.1, Windows 8, and Windows Server 2012 or later.
Pros and cons of using the Control Panel method
The Control Panel method has some advantages and disadvantages, such as:
You can use it to install .NET Framework 3.5 without running any application that requires it.
You can use it to enable or disable .NET Framework 3.5 as needed, saving disk space and bandwidth.
You can use it to install .NET Framework 3.5 from an alternative source, such as a DVD or a network share, if you don't have an internet connection.
You may need to enable some settings or features on your system to allow the Control Panel method to work properly.
You may encounter some errors or issues during the Control Panel method due to network problems or configuration conflicts.
Steps to use the Control Panel method
To use the Control Panel method, follow these steps:
Open the Control Panel by typing control panel in the Run dialog box (Windows key + R) or the search box on the taskbar.
Click Programs and then click Turn Windows features on or off. You may see a User Account Control prompt asking for your permission. Click Yes to continue.
In the Windows Features dialog box, find and check the box next to .NET Framework 3.5 (includes .NET 2.0 and 3.0). You may also check or uncheck any subfeatures as you wish.
Click OK to start the installation. You may see a progress bar and some messages indicating the status of the installation.
If you have an internet connection, Windows will download the required files from Windows Update. If you don't have an internet connection, or if you want to use an alternative source, click Let me pick from a list of available sources on this computer or Specify an alternate source path. Then, browse to the location of the source files, such as a DVD or a network share, and click OK.
Restart your computer if prompted. This will ensure that the changes take effect.
Verify that .NET Framework 3.5 is installed on your system by using one of the methods described in the previous section.
How to troubleshoot the installation of .NET Framework 3.5
Sometimes, you may encounter some errors or issues during the installation of .NET Framework 3.5 using any of the methods described above. These errors or issues may prevent you from installing .NET Framework 3.5 successfully or cause some problems with your system or applications. In this section, we will discuss some of the common installation errors and how to fix them.
Common installation errors and how to fix them
Here are some of the common installation errors and how to fix them:
Error 0x800f0906, 0x800f0907, or 0x800f081f
These errors may occur when you try to install .NET Framework 3.5 using the on-demand installation or the Control Panel method. They indicate that Windows cannot connect to Windows Update to download the required files for .NET Framework 3.5.
To fix these errors, you can try one of the following solutions:
Make sure you have an internet connection and that Windows Update is not blocked by a firewall or a proxy server.
Make sure you have enough disk space on your system drive (usually C:) to download and install .NET Framework 3.5.
Make sure you have installed all the latest Windows updates before installing .NET Framework 3.5.
Use the offline installer instead of the on-demand installation or the Control Panel method.
Use DISM to deploy .NET Framework 3.5 from an alternative source, such as a DVD or a network share. We will explain how to use DISM in the next section.
Error 0x800F0922
This error may occur when you try to install .NET Framework 3.5 using the Control Panel method. It indicates that there is not enough free space on the system partition (usually C:) to complete the installation.
To fix this error, you can try one of the following solutions:
Free up some disk space on your system partition by deleting some unnecessary files or moving them to another drive.
Use the offline installer instead of the Control Panel method.
Use DISM to deploy .NET Framework 3.5 from an alternative source, such as a DVD or a network share. We will explain how to use DISM in the next section.
Other errors
If you encounter any other errors or issues during the installation of .NET Framework 3.5, you can try one of the following solutions:
Run the .NET Framework Repair Tool, which can detect and fix some common problems with .NET Framework installations. You can download it from .
Run the System File Checker tool, which can scan and repair some corrupted system files that may affect the installation of .NET Framework 3.5. You can run it by typing sfc /scannow in the Command Prompt or PowerShell.
Run the Windows Update Troubleshooter, which can resolve some common issues with Windows Update that may prevent the installation of .NET Framework 3.5. You can run it by typing troubleshoot in the Run dialog box (Windows key + R) or the search box on the taskbar, and then selecting Windows Update from the list of troubleshooters.
Contact Microsoft Support or visit the Microsoft Community forums for more help and guidance.
How to use DISM to deploy .NET Framework 3.5
DISM (Deployment Image Servicing and Management) is a command-line tool that can be used to service and prepare Windows images, including those used for installation, recovery, and deployment. You can use DISM to deploy .NET Framework 3.5 from an alternative source, such as a DVD or a network share, if you don't have an internet connection or if you encounter any errors or issues with the other methods.
What is DISM and when to use it?
DISM is a tool that can perform various operations on Windows images, such as adding, removing, or updating features, drivers, packages, or applications. You can use DISM to deploy .NET Framework 3.5 in the following scenarios:
You don't have an internet connection or you have a slow or unreliable connection.
You have an alternative source of .NET Framework 3.5 files, such as a DVD or a network share.
You encounter any errors or issues with the on-demand installation or the Control Panel method.
You want to automate or customize the installation of .NET Framework 3.5 using scripts or commands.
Steps to use DISM to deploy .NET Framework 3.5
To use DISM to deploy .NET Framework 3.5, follow these steps:
Open the Command Prompt or PowerShell as an administrator by typing cmd or powershell in the Run dialog box (Windows key + R) or the search box on the taskbar, and then right-clicking the result and selecting Run as administrator.
Type the following command to enable .NET Framework 3.5 using the default source (Windows Update): dism /online /enable-feature /featurename:NetFx3 /All. If you have an alternative source, such as a DVD or a network share, specify the path to the source files using the /Source option, for example: dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs or dism /online /enable-feature /featurename:NetFx3 /All /Source:\\server\share\sources\sxs.
Wait for the command to complete. You may see a progress bar and some messages indicating the status of the operation.
Restart your computer if prompted. This will ensure that the changes take effect.
Verify that .NET Framework 3.5 is installed on your system by using one of the methods described in the previous section.
Conclusion
In this article, we have learned what .NET Framework 3.5 is, why we need it, how to check if we have it installed, how to download and install it using various methods, and how to troubleshoot some common installation errors. We hope that this article has helped you to understand and use .NET Framework 3.5 better.
If you have any questions or feedback, please feel free to leave a comment below or contact us through our website. We would love to hear from you and help you with any issues you may have.
Thank you for reading and happy coding!
Frequently Asked Questions
Here are some of the frequently asked questions and their answers about .NET Framework 3.5:
Q: Can I install .NET Framework 3.5 on Windows 7 or earlier versions?
A: Yes, you can install .NET Framework 3.5 on Windows 7 or earlier versions using the offline installer or the web installer. However, you cannot use the on-demand installation or the Control Panel method, as these features are not available on these versions of Windows.
Q: Can I install .NET Framework 3.5 on Windows 11?
A: Yes, you can install .NET Framework 3.5 on Windows 11 using any of the methods described in this article. However, you may need to enable some settings or features on your system to allow the installation of .NET Framework 3.5, such as Developer Mode or Windows Sandbox.
Q: Do I need to install .NET Framework 3.5 if I have a newer version of .NET Framework installed?
A: It depends on the application that you want to run. Some applications may require .NET Framework 3.5 specifically, while others may work with newer versions of .NET Framework. You can check the requirements of the application by visiting its website or contacting its developer.
Q: How can I uninstall .NET Framework 3.5 from my system?
A: You can uninstall .NET Framework 3.5 from your system by using one of the following methods:
If you installed .NET Framework 3.5 using the offline installer or the web installer, you can uninstall it from the Programs and Features section of the Control Panel. Just find and select Microsoft .NET Framework 3.5 SP1 and click Uninstall.
If you installed .NET Framework 3.5 using the on-demand installation or the Control Panel method, you can disable it from the Windows Features section of the Control Panel. Just find and uncheck the box next to .NET Framework 3.5 (includes .NET 2.0 and 3.0) and click OK.
If you installed .NET Framework 3.5 using DISM, you can disable it by using the following command in the Command Prompt or PowerShell as an administrator: dism /online /disable-feature /featurename:NetFx3.
Q: Where can I find more information about .NET Framework 3.5?
The official documentation of .NET Framework 3.5 on Microsoft Docs: .
The official blog of .NET Framework on Microsoft DevBlogs: .
The official support page of .NET Framework on Microsoft Support: .
The official forum of .NET Framework on Microsoft Q&A: .
The official community of .NET Framework on Stack Overflow: .
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