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Uri.CheckHostName Method

Determines whether the specified host name is a valid DNS name.

Namespace:  System
Assembly:  System (in System.dll)

'Declaration
Public Shared Function CheckHostName ( _
	name As String _
) As UriHostNameType

Parameters

name
Type: System.String
The host name to validate. This can be an IPv4 or IPv6 address or an Internet host name.

Return Value

Type: System.UriHostNameType
A UriHostNameType that indicates the type of the host name. If the type of the host name cannot be determined or if the host name is Nothing or a zero-length string, this method returns Unknown.

The CheckHostName method checks that the host name provided meets the requirements for a valid Internet host name. It does not, however, perform a host-name lookup to verify the existence of the host.

The following example checks whether the host name is valid.


 Console.WriteLine(Uri.CheckHostName("www.contoso.com"))



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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