I want to get a connection string from the app.config file. connectionString = System.Configuration.ConfigurationSettings.AppSettings["DBEntities"];

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Editorial Team

Asked: May 17, 20262026-05-17T17:47:29+00:00 2026-05-17T17:47:29+00:00

I want to get a connection string from the app.config file.

connectionString = System.Configuration.ConfigurationSettings.AppSettings["DBEntities"];

But it doesn’t work. It’s empty.

I cannot access the System.Configuration.ConfigurationManager because it’s .NET 4.
How can I get my connection string from the app.config?

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Editorial Team · Answer 1 · 2026-05-17T17:47:30+00:00

Editorial Team

Use

string connectionString = ConfigurationManager.ConnectionStrings[connectionName].ConnectionString;

Make sure to add reference to System.configuration in your project.

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