HOW TO SET NO BLUR FOR LINE CHART LINE SERIES C#

Hai EveryOne,

i have a problem from my grafik chart line series..
i want to set no blur if the grafik vertical, but if the line horizontal. the line not blur when zoom..

how this solustionn,,,

tihis is source code section

 LineSeries series = new LineSeries();
            series.CategoryMember = "MonthName";
            series.ValueMember = "TotalAsset";
            series.DataSource = m_LineChartList;
            series.PointSize = new SizeF(7, 7);
            series.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //test
            //series.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            //series.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            //series.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            //series.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            series.Padding = new Padding(20);
            series.IsVisible = true;
            series.LinesToLabelsColor = Color.FromArgb(0, 0, 0);

            series.BackColor = Color.FromArgb(0, 50, 0);
            series.BorderColor = Color.FromArgb(0, 50, 0);

thanks every one