01020304050607080910111213141516171819202122

public static IEnumerable<string> GetAbuseContactList(params string[] domainList) {    using(TcpClient client = new TcpClient("whois.abuse.net", 43)) {        using(NetworkStream stream = client.GetStream()) {            byte[] request = Encoding.UTF8.GetBytes(String.Join(" ", domainList) + "\r\n");            stream.Write(request, 0, request.Length);
            using(StreamReader streamReader = new StreamReader(stream)) {                while(!streamReader.EndOfStream) {                    string response = streamReader.ReadLine();
                    if(response.Contains("(")) {                        response = response.Substring(0, response.IndexOf('('));                    }
                    if(!String.IsNullOrWhiteSpace(response)) {                        yield return response.Trim();                    }                }            }        }    }}

010203040506070809101112

public static IEnumerable<string> GetAbuseContactList(params string[] domainList) {    foreach(string domain in domainList) {        DnsMessage response = DnsClient.Default.Resolve(            DomainName.Parse(domain + ".contacts.abuse.net"),            RecordType.Txt        );
        foreach(TxtRecord record in response.AnswerRecords) {            yield return record.TextData;        }    }}

0102030405060708

  // ["abuse@coders-online.net"]IEnumerable<string> abuseContactList = GetAbuseContactList("coders-online.net");
  // ["abuse@google.com", "abuse@microsoft.de"]abuseContactList = GetAbuseContactList("google.com", "microsoft.de");
  // ["abuse@facebook.com", "spamreport@spamreport.facebook.com"]abuseContactList = GetAbuseContactList("facebook.com");

01020304050607

public static class DnsUtility {    [DllImport("dnsapi", EntryPoint = "DnsFlushResolverCache")]    public static extern void FlushCache();}
  // DNS-Cache leerenDnsUtility.FlushCache();

01020304050607080910111213141516171819202122

public class Person {    public string FirstName {        get;        set;    }
    public string LastName {        get;        set;    }

    public void Marry(Person person) {        /* … */    }}

Debug.WriteLine(nameof(Person));            // "Person"Debug.WriteLine(nameof(Person.FirstName));  // "FirstName"Debug.WriteLine(nameof(Person.LastName));   // "LastName"Debug.WriteLine(nameof(Person.Marry));      // "Marry"

0102030405060708091011

using(Icon icon = Icon.ExtractAssociatedIcon("devenv.exe")) {      // Programmsymbol als *.ico-Datei speichern    using(FileStream fileStream = File.OpenWrite("devenv.ico")) {        icon.Save(fileStream);    }
      // Programmsymbol als *.png-Datei speichern    using(Bitmap bitmap = icon.ToBitmap()) {        bitmap.Save("devenv.png", ImageFormat.Png);    }}