How to increase thickness of lines in Line Charts?

How can we increase the thickness of the lines in Line charts (System.Web.UI.DataVisualization.Charting)? I tried to change the Font property of the Series, but found th开发者_开发问答at it's read-only.

chart1.Series["Default"].BorderWidth = 2;

Very helpful collection of examples: http://code.msdn.microsoft.com/Samples-Environments-for-b01e9c61

Click On chart, then you will see a Values filled and category groups Box on right side of graph, then in Values filled, right-click on any values Go to "Series Properties" --> "Border " -- > "Line Width" and then set the size.