>I am also interested to do the certification in VFP. Do you have ebook for VFP certification? If possible please send to me.

From https://hentzenwerke.com/oldl/GetLogin.old, "...source code, ebook files, and conference materials are restricted to customers..." You can purchase the eBook from http://www.hentzenwerke.com/catalogpricelists/catalogpricelistsebooks.htm.