Perhaps it's an idea to invest significantly more time in your replies, because it feels to me that I spend more time replying to you than you spend clarifying and proof-reading your requests for help. That's not how this is supposed to work in my view (assuming you want free help and a discussion that doesn't drag on for ages). Using the [ code ] .. [ / code ] tag would be nice too.

using System;
using System.Drawing;
using System.Linq;
using PowerLanguage.Function;

namespace PowerLanguage.Indicator
{
    [UpdateOnEveryTick(false), SameAsSymbol(true),RecoverDrawings(true)]
	
    public class Magnet_TrendLineCollection : IndicatorObject
 {
	    public Magnet_TrendLineCollection(object _ctx) : base(_ctx){}
		
        int[]numbers = new int[] {11120,11122,11124};
		
		//[Input]
        //public int firstprice { get; set; }
		
    protected override void StartCalc()
    {    
    }
	protected override void CalcBar()
	{
      {
		
		// Create the line's coordinates
		for (int i = 0; i < numbers.Length; i++)
	    {
        	ChartPoint beginPoint1 = new ChartPoint(Bars.Time[0],numbers[i]);
        	ChartPoint endPoint1   = new ChartPoint(Bars.Time[0],numbers[i]);
			ITrendLineObject MagnetLines = 
                    DrwTrendLine.Create(beginPoint1, endPoint1);
		            MagnetLines.ExtLeft  = true;
                    MagnetLines.ExtRight = true;
		            MagnetLines.Color = Color.LimeGreen;
		}
			   
      }
	    
    }
  }
}