namespace System.Net { public static class Dns { public static IAsyncResult BeginGetHostAddresses(string hostNameOrAddress, AsyncCallback requestCallback, object state); public static IAsyncResult BeginGetHostByName(string hostName, AsyncCallback requestCallback, object stateObject); public static IAsyncResult BeginGetHostEntry(IPAddress address, AsyncCallback requestCallback, object stateObject); public static IAsyncResult BeginGetHostEntry(string hostNameOrAddress, AsyncCallback requestCallback, object stateObject); public static IAsyncResult BeginResolve(string hostName, AsyncCallback requestCallback, object stateObject); public static IPAddress[] EndGetHostAddresses(IAsyncResult asyncResult); public static IPHostEntry EndGetHostByName(IAsyncResult asyncResult); public static IPHostEntry EndGetHostEntry(IAsyncResult asyncResult); public static IPHostEntry EndResolve(IAsyncResult asyncResult); public static IPAddress[] GetHostAddresses(string hostNameOrAddress); public static Task<IPAddress[]> GetHostAddressesAsync(string hostNameOrAddress); public static IPHostEntry GetHostByAddress(IPAddress address); public static IPHostEntry GetHostByAddress(string address); public static IPHostEntry GetHostByName(string hostName); public static IPHostEntry GetHostEntry(IPAddress address); public static IPHostEntry GetHostEntry(string hostNameOrAddress); public static Task<IPHostEntry> GetHostEntryAsync(IPAddress address); public static Task<IPHostEntry> GetHostEntryAsync(string hostNameOrAddress); public static string GetHostName(); public static IPHostEntry Resolve(string hostName); } }