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DnsEndPoint Constructor (String, Int32, AddressFamily)

Initializes a new instance of the DnsEndPoint class with the host name or string representation of an IP address, a port number, and an address family.

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

Public Sub New ( _
	host As String, _
	port As Integer, _
	addressFamily As AddressFamily _


Type: System.String
The host name or a string representation of the IP address.
Type: System.Int32
The port number associated with the address, or 0 to specify any available port. port is in host order.
Type: System.Net.Sockets.AddressFamily
One of the AddressFamily values.


The host parameter contains an empty string.


addressFamily is Unknown.


The host parameter is a Nothing.


port is less than MinPort.


port is greater than MaxPort.

The DnsEndPoint(String, Int32, AddressFamily) constructor can be used to initialize a DnsEndPoint class using either a host name or a string that represents an IP address, a port, and an address family.

When using the constructor with a host name rather than a string representation of an IP address, the address family restricts DNS resolution to prefer addresses of the specified address family value. When using the constructor with the address family specified as Unknown, the address family of the DnsEndPoint will remain Unknown even after use. The AddressFamily property of any Socket that is created by calls to the ConnectAsync method will be the address family of the first address to which a connection can be successfully established (not necessarily the first address to be resolved).

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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.