How to use Trackback (Reference: http: ///dev.9cbs.net/develop/article/56/56654.shtm) (Reference: http://www.donews.net/amaya/archive/2004/07/03/ 37275.ASPX) The day before yesterday, I feel very good. I tried DataGridView (former DataGrid), cool, support for the first few columns, support more attributes. For example, background color, support unit Double-click event ... Added a SerialPort control (that is, the previous MSCOMM control), it is simple, such as: reading: strread = me.serialport1.readexisting () Write: me.serialport1.writeLine strWrite) but ReceivedEvent event in the EventType EventArgs supports only two of IO.Ports.SerialReceived.EofReceivedIO.Ports.SerialReceived.ReceivedChars (so comEvRing is not on the undetectable?) simply looked at yesterday made a simple NUnit The test engineering (refer to http://www.microsoft.com/china/community/program/originalarticles/techdoc/nunit.mspx) downloads a bunch of information about the test, and slowly studies later. Download a chart control yesterday - Teechart, did not come and see, I tried it today, there are still a few questions, I haven't figured it out (http://www.teechart.net/), to see how to use TRACKBACK>