How To Find Integers In Multiple List

May 27, 2010

In a vb.net application I have a set of integers currently stored in multiple Arraylist (But this could be something different if required)

al1 = {1, 2, 3, 6, 7, 9}
al2 = {2, 3, 4, 9}
al3 = {2, 3, 19}

I would like to get the set {2, 3}

I thought about using LINQ to join the list, but the number of Arraylist can change. I know I can always loop through everything and check if an integer exsist and keep track of it, but I thought there might be an easier way?

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