ThreadPool.QueueUserWorkItem() method 
class CApp { 
static void Main() { 
string s = "Hello, World"; 
ThreadPool.QueueUserWorkItem( new WaitCallback( DoWork ), s ); 
Thread.Sleep( 1000 ); // Give time for work item to be executed 
}
// DoWork is executed on a thread from the thread pool. 
static void DoWork( object state ) { 
Console.WriteLine( state ); } 
}