need help for a simple indicator

Hi everyone

i searched too much but i couldnt find and i cant make any algo

i need very simple thing

need an indicator that i give it a base line (zero line , like 1995.14) and give that a pip value (like [Parameter(DefaultValue = 780]) so it will make 10 horizonal line to up and 10 to bottom

so u will 20 level that the distance between every level will be 780 pips

can anyone help me to make it? 

i will be so thankful

its my program

using System;
using cAlgo.API;

namespace calgo
{
    [Indicator(IsOverlay = true)]
    public class keylevels : Indicator
    {
        [Parameter(DefaultValue = 780)]
        public int StepPips { get; set; }

        protected override void Initialize()
        {
            double max = MarketSeries.High.Maximum(MarketSeries.High.Count);
            double min = MarketSeries.Low.Minimum(MarketSeries.Low.Count);

            double step = Symbol.PipSize * StepPips;
            double start = Math.Floor(min / step) * step;

            for (double level = 1900.49; level <= max + step; level += step)
            {
                ChartObjects.DrawHorizontalLine("line_" + level, level, Colors.Purple);
            }
        }

        public override void Calculate(int index)
        {
        }
    }

but its useless.....