4. find all the pairs whose sum is equal to a given number in an unsorted array?

List _l=new List();

arrayList _a=new AerrayList(){1,2,3,4,5,6,4,7};

ArrayList _b=_a;

foreach(int _i in _a)

foreach(int _j in _b)

if(_i+_j==9)

_l.Add(new pairData(){A=_i,B=_j});

foreach(var _item in _l)

Console.WriteLine("{0},{1}",_item.A,item.B);

####################

class pairData{

public int A{get;set;}

public int B{get;set;}

}

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