MyExtensions.linq

<Query Kind="Program">
  <Reference>&lt;RuntimeDirectory&gt;\System.Web.DataVisualization.dll</Reference>
  <Reference>&lt;RuntimeDirectory&gt;\System.Web.dll</Reference>
  <Namespace>System.Web.UI.DataVisualization.Charting</Namespace>
  <Namespace>System.Drawing</Namespace>
</Query>

void Main()
{
  var r = new Random();
	Enumerable.Range(1, 25).Select(x => r.Next(1, 50)).AsSparkLines().Dump();
}

public static class MyExtensions
{
		public static Image AsSparkLines(this IEnumerable<int> values, int width = 120, int height = 50, int low = 0, int high = 100)
	{
		return values.Select(x => (double)x).AsSparkLines(width, height);
	}

	public static Image AsSparkLines(this IEnumerable<double> values, int width = 120, int height = 50, int low = 0, int high = 100)
	{
		var chart = new Chart();
		var series = new Series();
		chart.Series.Add(series);
		series.ChartType = SeriesChartType.Spline;
		series.BorderWidth = 2;
	
		var x = 0;
		foreach(var value in values)
		{
			series.Points.AddXY(DateTime.Now.AddDays(x++), value + 5);
		}
	
		var chartArea = new ChartArea();
		chart.ChartAreas.Add(chartArea);
		chartArea.AxisX.LabelStyle.Enabled = false;
		chartArea.AxisY.LabelStyle.Enabled = false;
		chartArea.AxisX.MajorGrid.Enabled = false;
		chartArea.AxisY.MajorGrid.Enabled = false;
		chartArea.AxisX.MajorTickMark.Enabled = false;
		chartArea.AxisY.MajorTickMark.Enabled = false;
		chartArea.AxisX.LineWidth = 0;
		chartArea.AxisY.LineWidth = 0;
		chartArea.AxisY.Minimum = low;
		chartArea.AxisY.Maximum = high + 10;
			
		chart.Width = width;
		chart.Height = height;
		
		using(var s = new MemoryStream())
		{
			chart.SaveImage(s, ChartImageFormat.Png);
			s.Position = 0;
		
			return Image.FromStream(s);
		}
	}
	
}

// You can also define non-static classes, enums, etc.