Provides options for selecting methods of automatic detection of the DNS servers registered in the system.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Remarks

If multiple methods are specified, they are tried in the order their values increase until at least one DNS server definition is found.

To search WMI database (Wmi option), the application must have appropriate permissions to use System.Management.dll (which encapsulates Management namespace). For instance, web applications configured to run on "High" trust level have no permissions to access this assembly. In this case, Autodetect method will not find any DNS server records in WMI database. Changing trust level to "Full" eliminates the problem.

To use System.Net.NetworkInformation.NetworkInterface class (the best method available), "High" trust level might also require "Full" level.

Example

This sample populates the collection of DNS servers with the servers defined in the config files (such as app.config, web.config, or machine.config). If it does not find any DNS server definitions in the config files, then Windows registry is searched.

[C#]
// To use the code below, import MailBee namespaces at the top of your code
using MailBee;
using MailBee.SmtpMail;
using MailBee.DnsMX;

// The actual code
Smtp smtp = new Smtp();
smtp.DnsServers.Autodetect(DnsAutodetectOptions.ConfigFiles | DnsAutodetectOptions.Registry);

// Example of XML config file settings which must be placed into <appSettings> section of the file
// (<appSettings> can also appear as <applicationSettings> in .NET 2.0).
// It defines 2 DNS servers with top (0) priority and 1 backup server with lower (1) priority
// (for 192.168.0.2 server, the priority is not specified and thus defaults to the top priority):

<add key="MailBee.DnsMX.DnsServerCollection" value="192.168.0.1,0;192.168.0.2;192.168.0.100,1"/>

[Visual Basic]
' To use the code below, import MailBee namespaces at the top of your code
Imports MailBee
Imports MailBee.SmtpMail
Imports MailBee.DnsMX

' The actual code
Dim smtp As New Smtp 
smtp.DnsServers.Autodetect(DnsAutodetectOptions.ConfigFiles Or DnsAutodetectOptions.Registry) 

' Example of XML config file settings which must be placed into <appSettings> section of the file
' (<appSettings> can also appear as <applicationSettings> in .NET 2.0).
' It defines 2 DNS servers with top (0) priority and 1 backup server with lower (1) priority
' (for 192.168.0.2 server, the priority is not specified and thus defaults to the top priority):

<add key="MailBee.DnsMX.DnsServerCollection" value="192.168.0.1,0;192.168.0.2;192.168.0.100,1"/>

Members

Requirements

Namespace: MailBee.DnsMX

Assembly: MailBee.NET (in MailBee.NET.dll)

See Also

MailBee.DnsMX Namespace | Smtp

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