This documentation is archived and is not being maintained.

DnsPermissionAttribute Constructor

Initializes a new instance of the DnsPermissionAttribute class with the specified SecurityAction value.

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

Public Sub New ( _
	action As SecurityAction _
Dim action As SecurityAction 

Dim instance As New DnsPermissionAttribute(action)


Type: System.Security.Permissions.SecurityAction

One of the SecurityAction values.


The action parameter is not a valid SecurityAction.

The SecurityAction value that is passed to this constructor specifies the allowable DnsPermissionAttribute targets.

The following example uses DnsPermissionAttribute to apply declarative security to a custom class.

' Uses the DnsPermissionAttribute to restrict access only to those who have permission.
<DnsPermission(SecurityAction.Demand, Unrestricted := true)>  _
Public Class MyClass1

   Public Shared Function GetIPAddress() As IPAddress
      Dim ipAddress As IPAddress = Dns.Resolve("localhost").AddressList(0)
      Return ipAddress
   End Function 'GetIPAddress

   Public Shared Sub Main()
         ' Grants Access.
         Console.WriteLine(("Access granted" + ControlChars.NewLine + " The local host IP Address is :" + MyClass1.GetIPAddress().ToString()))
      ' Denies Access. 
      Catch securityException As SecurityException
         Console.WriteLine("Access denied")
      End Try 
   End Sub 'Main 
End Class '[MyClass1]
//Uses the DnsPermissionAttribute to restrict access only to those who have permission.
[DnsPermission(SecurityAction::Demand, Unrestricted = true)]
public __gc class MyClass{
    static IPAddress* GetIPAddress(){
        IPAddress* ipAddress = Dns::Resolve(S"localhost")->AddressList[0];
        return ipAddress;

int main(){
        //Grants Access.
        Console::WriteLine(S" Access granted\n The local host IP Address is :{0}", MyClass::GetIPAddress());
    // Denies Access.
    catch(SecurityException* securityException){
        Console::WriteLine(S"Access denied");	

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

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