This process encountered a few days to write the code needs need to use an external program to start AutoCAD, and
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Research start AutoCAD method of using an external application (startup splash screen control production and CreateProcess to start exploring AutoCAD)
https://blog.csdn.net/panzhijiepanzhiyang/article/details/40824205
external program to solve the problem by RPC_E_CALL_REJECTED when COM AutoCAD way to start
https : //www.cnblogs.com/junqilian/archive/2011/08/21/2148630.html
how the application starts AutoCAD
https://blog.csdn.net/yuandingmao/article/details/5558763
how to implement a splash screen ( transparency PNG images) in
https://bbs.csdn.net/topics/90278647
C # to make a boot screen (Splash screen)
https://blog.csdn.net/xinruodingshui/article/details/32152157
C #: generated based WinForm the irregular form or control
https://blog.csdn.net/jhqin/article/details/6922380
C # Winform achieve cool transparent animated interface (reprint)
https://www.cnblogs.com/Joetao/articles/ 4631868.html
HOW the TO: splash screen (Splash screen), also known as the program starts making the screen (.NET2003)
https://www.cnblogs.com/lzmtw/archive/2005/10/31/265782.html
Do not let dry, etc. --- user to your WinForms start the animation program plus
https://www.cnblogs.com/ rockniu / archive / 2009/09/ 13 / 1565746.html
Art word generating
http://www.jiqie.com/a/34.htm
