Answer to Question #39820 in C# for saji

Question

HiI have an App.Config file to make connection string in C# project. this is my code
when I use this code where (AttachDbFilename=|DataDirectory|Database.mdf) my data hasn't saved in database but when I use full path like this (AttachDbFilename="C:Usersuser1Documents...Database.mdf) data has saved successfully.

what's happened? What can I do?
thanks