Grafik Chart Line using Line Series Set Space Beetween Point YAxes

Hi Everyone , I have some problem for set Space Beetween Point Y, i want to set space look the image,

this is source code

private void DrawRadChartViewLine(RadChartView p_oRadChartView, bool bIsGrey)
        {

            p_oRadChartView.AreaType = ChartAreaType.Cartesian;
            p_oRadChartView.Series.Clear();

            #region Config New Chart Series
            LineSeries series = new LineSeries();
            series.CategoryMember = "MonthName";
            series.ValueMember = "TotalAsset";
            series.DataSource = lDataLine;
            series.PointSize = new SizeF(7, 7);
            series.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            series.Padding = new Padding(20);
            series.IsVisible = true;            

            p_oRadChartView.Series.Add(series);
            #endregion

            #region Grid Area Formatting

            CartesianArea area = p_oRadChartView.GetArea<CartesianArea>();
            area.ShowGrid = true;

            CartesianGrid grid = area.GetGrid<CartesianGrid>();
            grid.Size = new Size(970, 160);
            grid.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            grid.DrawHorizontalFills = true;
            grid.DrawHorizontalStripes = true;
            grid.DrawVerticalFills = true;
            grid.DrawVerticalStripes = false;
            grid.ForeColor = Color.FromArgb(239, 229, 216); //228, 210, 190
            grid.Padding = new Padding(15);
            grid.BorderDashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
            grid.BorderWidth = 3.5f;//2.5f;                 

            if (bIsGrey)
            {
                area.Grid.BackColor = Color.FromArgb(246, 246, 246);
                area.Grid.BackColor2 = Color.FromArgb(246, 246, 246);
                area.Grid.AlternatingBackColor = Color.FromArgb(246, 246, 246);
                area.Grid.AlternatingBackColor2 = Color.FromArgb(246, 246, 246);
            }
            else
            {
                area.Grid.BackColor = Color.FromArgb(252, 249, 247);
                area.Grid.BackColor2 = Color.FromArgb(252, 249, 247);
                area.Grid.AlternatingBackColor = Color.FromArgb(252, 249, 247);
                area.Grid.AlternatingBackColor2 = Color.FromArgb(252, 249, 247);
            }


            #endregion
        }

i hope someone in this forum can help me..

thanky,, Regards Genda..