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Asynchronous Calls

using System; delegate void FuncToCall(string s); class MainClass {          public static void WriteLineCallback(IAsyncResult iar)     {         Console.WriteLine("In WriteLineCallback");         FuncToCall func = (FuncToCall) iar.AsyncState;         func.EndInvoke(iar);     }          public static void CallWriteLineWithCallback(string s)     {         FuncToCall func = new FuncToCall(Console.WriteLine);         func.BeginInvoke(s, new AsyncCallback(WriteLineCallback), func);     }     public static void Main()     {         CallWriteLineWithCallback("Hello There");                  System.Threading.Thread.Sleep(1000);     } } Hello There In WriteLineCallback