[C#]

using System;
using aspNetDns;
using aspNetDns.Records;

string LookupRecord  = "microsoft.com";
DnsQuery dns = new DnsQuery();
ResourceRecord[] records = dns.GetDnsRecords( DnsQueryType.A, LookupRecord );
if( records.Length > 0 )
{
	foreach( ResourceRecord r in records )
	{
		Console.WriteLine( r.AnswerString );
	}
}
else
{
	Console.WriteLine( "no address records exist for " + LookupRecord );
}

[Visual Basic]

Imports aspNetDns
Imports aspNetDns.Records


Dim LookupRecord As String = "microsoft.com"
Dim dns As New DnsQuery()
Dim records As ResourceRecord() = dns.GetDnsRecords(DnsQueryType.A, LookupRecord)
If records.Length > 0 Then
    Dim r As ResourceRecord
    For Each r In records
        Console.WriteLine(r.AnswerString)
    Next r
Else
    Console.WriteLine(("no address records exist for " + LookupRecord))
End If

[C#]

static void Main(string[] args)
{
	string LookupRecord = "microsoft.com";
	AddressRecord.GetAddressRecordsAsync( LookupRecord,  
	new ARecordDelegate( RetrieveAddressRecord) );
}

private static void RetrieveAddressRecord(AddressRecord[] records)
{
	if( records.Length > 0 )
	{
		foreach( AddressRecord r in records )
			Console.WriteLine( r.AnswerString );
	}
	else
		Console.WriteLine( "No records were found.");

	Console.ReadLine();
}

[Visual Basic]

Sub Main()
    
        Dim LookupRecord As String = "microsoft.com"
        AddressRecord.GetAddressRecordsAsync(LookupRecord, 
        New ARecordDelegate(AddressOf RetrieveAddressRecord))

End Sub

Private Sub RetrieveAddressRecord(ByVal records() As AddressRecord)
    If records.Length > 0 Then
        Dim r As AddressRecord
        For Each r In records
            Console.WriteLine(r.AnswerString)
        Next r
    Else
        Console.WriteLine("No records were found.")
    End If
    Console.ReadLine()
End Sub

• AAAA (IPv6) Record
• Address Record
• Canonical Name (CName) Records
• Host Information Records
• ISDN Records
• MailBox (MB) Records
• MailBox Rename (MR) Records
• Mail Destination Records
• Mail Exchange (MX) Records
• Mail Forwarder Records
• Mail Group Records
• Mail Information Records
• Name Server (NS) Records
• NULL Records
• Pointer (Reverse Lookup) Records
• Responsible Person (RP) Records
• Route Through (RT) Records
• Start Of Authority (SOA) Records
• Service (SRV) Records
• Text (TXT) Records
• Well Known Services (WKS) Records
• X25 Records

The System.Net.Dns namespace only returns IPHostEntry values. Basically this means that it can only perform Address record lookup and Reverse Lookups. However, because windows can employ netbios and wins, sometimes these methods actually return Netbios and Wins database information, instead of the actual information found in the DNS Servers, resulting in fault results.

aspNetDns can perform over 20 different queries. It can perform all of these synchronously or asynchronously. It also has the capability of using different DNS servers for Fail over capabilities. aspNetDns also has the capability to specify timeouts and return all records that belong to a DNS class. For a tabular comparison, view aspNetDns Features