做二次开发总是有人问Personal Geodatabase的Lock问题，这是ESRI开发文档中的解释，摘录如下。
但是在实际操作中，比如ArcCatalog移走焦点+刷新似乎并不能解除对当前MDB的锁定。
Whenever a program is updating a dataset, such as a feature class or table, be careful to
avoid situations in which the dataset is locked. Microsoft Access always locks a database
for update operations when a table is accessed, so if you have a personal geodatabase
open in ArcCatalog, a program will not be able to update any of the geodatabase's
contents until it is deselected and the folder is refreshed or ArcCatalog is closed.