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Dictionary keys printing problem

Javed Iqbal

Why is this code printing the same 'key' once only?

Dictionary dictionary = new Dictionary();

var keys=new List();

try

{

dictionary.Add(5, "javed");

dictionary.Add(5, "khan");

dictionary.Add(5, "javed");

}

catch (ArgumentException)

{

Console.WriteLine("Key/Value pair already used");

}

finally

{

foreach (int key in dictionary.Keys)

{

Console.WriteLine(key);

}

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