Introduction - If you have any usage issues, please Google them yourself
Asp. Net on the use of the sample (PPT). There are matters to the attention of Asp. Net, the use of user controls, OCX creation and use, and the use of some techniques (such as clicking on the Remove button need to recognize (subject from the background source added), background javascript output of the three, leaves a very long time after postback how to return to the original location )