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//Labda
Func<int, int> F1 = x => x + 1;
Func<int, int> F2 = x => x + 1;
Func<int, int> F3 = x => x + 1;
Func<int, int, int> F4 = delegate ( int x, int y ){
     return x + y;
};            

//Block with task
Task<int> futureA = Task.Factory.StartNew<int>(() => F1(1));
int c = F2(1);
int d = F3(c);
int f = F4(futureA.Result, d);
Console.WriteLine("ResultA:" + f);

//Continuation Tasks
var futureB = Task.Factory.StartNew<int>(() => F1(1));
var futureD = Task.Factory.StartNew<int>(() => F3(F2(1)));
var futureF = Task.Factory.ContinueWhenAll<int, int>(
                 new[] { futureB, futureD },
                 ( tasks ) => F4(futureB.Result, futureD.Result));

futureF.ContinueWith(( t ) =>
    Console.WriteLine("ResultF:" + t.Result)
);

Console.WriteLine("Code...End");