从DataGridView中删除不会自动从中删除数据库.
下面的链接描述了它的运行方式.

尽管Jet OLE DB提供程序允许您在Excel工作簿中插入和更新记录，但它不允许DELETE操作."
- MSDN [

Deleting from DataGridView won''t automatically delete from database anyway.
The link below describes how it goes.

"Although the Jet OLE DB Provider allows you to insert and update records in an Excel workbook, it does not allow DELETE operations."
-MSDN[^]