How do I check if my array has repeated values inside it?

Question

So here is my array.

double[] testArray = new double[10];
// will generate a random numbers from 1-20, too lazy to write the code

I want to

Answer 1

Use this:

bool CheckUniqueness(double[] values)
{
    var uniqueValues = new HashSet();
    foreach (double d in values)
    {
        if(uniqueValues.Contains(d))
        {
            return false;
        }
        uniqueValues.Add(d);
    }
    return true;
}