using System;

public class Program

{

    public static void Main()

    {

        decimal[] dataset = new decimal[]{0,2,3,4,5,3,2,1,-5,3,2,1,2,1,2,1};

        var lastval = dataset[0];

        var lastindex = 0;

        bool dirpos = true;

        for (int i=0; i<dataset.Length;i++)

        {

            var currentval= dataset[i];

            if (dirpos && currentval<lastval)

            {

                Console.WriteLine(string.Format("i: {0} value: {1}",lastindex,dataset[lastindex]));

                dirpos = false;

            }

            if (currentval>=lastval)

                dirpos = true;

            lastval= currentval;

            lastindex = i;

        }

    }

}