This article describes how to determine which versions of the Microsoft .NET Framework are installed on your computer. This article also helps you determine whether any .NET Framework service packs are installed on the computer. For more information about service packs for the .NET Framework, click the following article number to view the article in the Microsoft Knowledge Base: The Microsoft Update service updates the versions of the .NET Framework that are installed on the computer. To make sure that the computer is always up to date, enable Automatic Updates in Control Panel.

Back to the top

Versions of the .NET Framework

There are currently three released versions of the .NET Framework. The releases have the following version information.

.NET Framework version	Revision	Version
1.0	Original RTM .NET Framework Service Pack 1 .NET Framework Service Pack 2 .NET Framework Service Pack 3	1.0.3705.0 1.0.3705.209 1.0.3705.288 1.0.3705.6018
1.1	Original RTM .NET Framework Service Pack 1 .NET Framework included with Windows Server 2003 32-bit Service Pack 1	1.1.4322.573 1.1.4322.2032 1.1.4322.2300
2.0	Original RTM	2.0.50727.42

Note The Microsoft .NET Framework 1.1 is included with the 32-bit version of Microsoft Windows Server 2003.

Note This information should be used as a general guide for determining which versions of the .NET Framework are installed on a computer. Also note that files that have a later version listed may be files that were shipped as part of a hotfix or a hotfix rollup package. The hotfix .NET Framework file versions are outside the scope of this article.

Back to the top

Determine which versions of the .NET Framework are installed on a computer

The easiest way to determine which versions of the .NET Framework are installed on a computer is to locate the %systemroot%\Microsoft.NET\Framework folder. You can paste the listed address for the Framework folder into a Windows Explorer address bar to navigate to the Framework folder. The three released versions of the .NET Framework are contained in the following folders:

•	v1.0.3705
•	v1.1.4322
•	v2.0.50727

Note If you see other directories that have a vN.N.NXXXX format that are not listed in this article, the versions may be beta versions or pre-released versions of the .NET Framework. Those versions are outside the scope of this article.

To determine which versions of the .NET Framework are installed on a computer, follow these steps:

1.	Open any one of the folders in the previous list, and then locate the Mscorlib.dll file.
2.	Right-click the file, and then click Properties.
3.	Click the Version tab, and then note the file version.
4.	Use the previous list to determine which version of the .NET Framework is installed on the computer, and then click OK.

Repeat these steps for each version of the .NET Framework on the computer.

Back to the top

Troubleshooting the .NET Framework installations

For more information about troubleshooting the .NET Framework installation, click the following article numbers to view the articles in the Microsoft Knowledge Base:

Back to the top

For more information about the benefits of the .NET Framework, click the following article number to view the article in the Microsoft Knowledge Base: For more information about the various configutations of the .NET Framework 1.1, click the following article number to view the article in the Microsoft Knowledge Base: For more information about file versions, visit the following Microsoft Web site: For developers, Aaron Stebner's WebLog has two entries that are interesting. To view the entry that contains Visual C++ sample code to programmatically detect .NET Framework 1.0 , 1.1, and 2.0 and their service packs, visit the following Microsoft Developer Network (MSDN) Web site: To view the entry that discusses versions of the .NET Framework in the context of Microsoft Visual Studio, visit the following MSDN Web site:

Back to the top