Now that Microsoft .NET Framework 4.0 and Visual Studio 2010 have been released, developers may wonder how to detect them on the system. As with previous releases, we support registry detection of either product family and Windows Installer component detection for Visual Studio. Detecting either product uses a separate set of supported keys.
.NET Framework 4.0The .NET Framework has and continues to use registry keys and values under HKLM\Software\Microsoft\NET Framework Setup. To detect .NET Framework 4.0, you can check if the following key is present and the value is set to 1.
Key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Client
Name Install
Type REG_DWORD (32-bit integer)
Data 0x00000001 (1)The core .NET Framework 4.0 package is English, so 1033 is always available. To detect specific language support, see the LCIDs listed in the table of supported languages. You can also detect if the full package is installed, which includes the core (Client) and extended support, such as ASP.NET.
Key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full
Name Install
Type REG_DWORD (32-bit integer)
Data 0x00000001 (1)For more information, see the .NET Framework 4.0 deployment guide for developers. Administrators may be interested in the .NET Framework deployment guide for administrators.
Visual Studio 2010The detection keys for Visual Studio are used both to detect if the product is installed and what service pack level is installed. As with previous versions, these keys and values are under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DevDiv\VS\Servicing.
Key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DevDiv\VS\Servicing\10.0\$(var.ProductEdition)\$(var.LCID)
Name Install
Type REG_DWORD (32-bit integer)
Data 0x00000001 (1)Read more: Detection keys for .NET Framework 4.0 and Visual Studio 2010
.NET Framework 4.0The .NET Framework has and continues to use registry keys and values under HKLM\Software\Microsoft\NET Framework Setup. To detect .NET Framework 4.0, you can check if the following key is present and the value is set to 1.
Key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Client
Name Install
Type REG_DWORD (32-bit integer)
Data 0x00000001 (1)The core .NET Framework 4.0 package is English, so 1033 is always available. To detect specific language support, see the LCIDs listed in the table of supported languages. You can also detect if the full package is installed, which includes the core (Client) and extended support, such as ASP.NET.
Key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full
Name Install
Type REG_DWORD (32-bit integer)
Data 0x00000001 (1)For more information, see the .NET Framework 4.0 deployment guide for developers. Administrators may be interested in the .NET Framework deployment guide for administrators.
Visual Studio 2010The detection keys for Visual Studio are used both to detect if the product is installed and what service pack level is installed. As with previous versions, these keys and values are under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DevDiv\VS\Servicing.
Key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DevDiv\VS\Servicing\10.0\$(var.ProductEdition)\$(var.LCID)
Name Install
Type REG_DWORD (32-bit integer)
Data 0x00000001 (1)Read more: Detection keys for .NET Framework 4.0 and Visual Studio 2010
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