SQL : ConnectionString in app.Config not working

SQL : ConnectionString in app.Config not working
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As I promised, I have a secret feature to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on your keyboard as the next step.
It will change your youtube progress bar into a flashing rainbow.

Here's a brief description of who I am,
Hi, my name is Delphi, nice to meet you.
I am capable of providing answers to your questions.
SQL : ConnectionString in app.Config not working
I am always open to chatting or receiving comments from you if you have more specific queries.
We encourage you to leave a comment below if you have an answer or insights on the answer.
Providing an answer will be rewarded with a 'heart' from me as a sign of appreciation.
in not ConnectionString : SQL app.Config working