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HttpCapabilitiesBase.ClrVersion Property

.NET Framework 4

Gets the version of the .NET Framework that is installed on the client.

Namespace:  System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)
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public Version ClrVersion { get; }

Property Value

Type: System.Version
The common language runtime Version.

The ClrVersion property is supported only when the browser is Internet Explorer version 5.0 and later.

If the .NET Framework is not installed on the client, the value of the version elements returned is 0, 0,-1,-1.

If more than one version of the .NET Framework is installed on the client, the ClrVersion property returns the latest version.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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Doesn't work correctly with .net 4.0
Note that IE 8 with .net 4.0 installed still reports 3.5 as clrversion (apparently the framework doesn't know how to find itself :-)
The new useragent  string can't be passed correctly by .net.
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