C ＃ solve the relative path problem using SQLite

Problem description ： I put data.db Put it under the project , The project is packaged as exe It is impossible to use it later Absolute path !!!

The solution is shown in the figure ： （test_project It's my project name ）
Debug Pattern ：|DataDirectory| Refer to test_project\bin\Debug

Release Pattern ：|DataDirectory| Refer to test_project\bin\Release

App_Data The folder contains the application's local data store