Serial Port Data To Graph

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serial-port

ZedGraph

HI there everyone;

i'm new developer of c#, i wanted to plot the data which is comming from serial port, i wrote some code but it din't work for me, are there any suggestions for me to do it easily?

 public void draw_Graph(object sender, EventArgs e)
        {
            _xvalue = new double[Larray.Length];
            _yvalue = new double[Larray.Length];
            for (int i = 0; i < Larray.Length; i++)
            {
//Larray is the byte variable from filestream. i saved it to stream.
                _xvalue[i] = i;
                _yvalue[i] = Convert.ToDouble(Larray[i]);
            }
            _myPionts = new PointPairList(_xvalue, _yvalue);
            LineItem _myLine = _myPane.AddCurve("Sine Wave", _myPionts, Color.Black, SymbolType.None);
            _myLine.Line.IsAntiAlias = true;
            _myLine.Line.IsSmooth = true;

            zedGraphControl1.AxisChange();
            zedGraphControl1.Invalidate();
            zedGraphControl1.Refresh();
        }

this is the function which i made program compiles and runs but it doesn't plot anything.