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Language/Type: C# arrays traversals

Write a method named CountDuplicates that accepts an array of integers as a parameter and that returns the number of duplicate values in the array. A duplicate value is a value that also occurs earlier in the array. For example, if an array named a contains [1, 4, 2, 4, 7, 1, 1, 9, 2, 3, 4, 1], then the call of CountDuplicates(a) should return 6 because there are three duplicates of the value 1, one duplicate of the value 2, and two duplicates of the value 4.

Constraints: The array could be empty or could contain only a single element; in such cases, your method should return 0. Do not modify the contents of the array.

Method: Write a C# method as described, not a complete program or class.

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