ZedGraph
ZedGraph 是一套免費的繪製圖表 Control，不僅 Window Form 可以使用連 Web Form 也支援，適用語言包括： VC++.NET、VB.NET、C#。
ZedGrpah 是我目前為止找到，免費而且彈性最好的繪圖控制項！
ZedGraph is a set of classes, written in C#, for creating 2D line and bar graphs of arbitrary datasets. The classes provide a high degree of flexibility -- almost every aspect of the graph can be user-modified. At the same time, usage of the classes is kept simple by providing default values for all of the graph attributes.
The classes include code for choosing appropriate scale ranges and step sizes based on the range of data values being plotted. ZedGraph also includes a UserControl interface, allowing drag and drop editing within the Visual Studio forms editor, plus access from other languages such as C++ and VB.