How to set relative path to database file into web.config?

Question

I'm trying to set relative path of database file into my web.config . I have two projects: DAL (class library), WebApi application. My database store in App_Date folder in DAL. I want to set the connection string to web.config of WebApi project.

<add key="connectionString" value="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|Data Directory|\DAL\App_Data\Taskstorage.mdf;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"/>

And this is another example:

<add key="connectionString" value="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=~\..\DAL\App_Data\Taskstorage.mdf;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"/>

None of them is working. Could you tell me how to fix this problem?

Answer 1

try the following code to read your config file.

using System.Configuration;
string t=ConfigurationManager.AppSettings["connectionString"].ToString();