How to calculate excel percentile in C#?

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C#

MS-Excel

Hello All , i'm stucked in C# , to get the percentile from array of column values .please check the below code and let me know how can i pass the arguments to the method .

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public double Percentile(double[] sequence, double excelPercentile)
        {
            Array.Sort(sequence);
            int N = sequence.Length;
            double n = (N - 1) * excelPercentile + 1;
            // Another method: double n = (N + 1) * excelPercentile;
            if (n == 1d) return sequence[0];
            else if (n == N) return sequence[N - 1];
            else
            {
                int k = (int)n;
                double d = n - k;
                return sequence[k - 1] + d * (sequence[k] - sequence[k - 1]);
            }
        }

and i have the array of data - and also k value as 0.95.
percentile(myarray , K);
the above method sending me error . please let me know , what is my mistake.

What I have tried:

When i call the method

percentile(myarray , K);
i have doubt here at calling the method

Error :
Object reference is required for non-static field, method .