Web Reference: Jul 23, 2022 ยท The code uses the OpenExeConfiguration method to open the app.config file for editing, and the GetSection method returns the connectionStrings section. The code then checks the IsProtected property, calling the ProtectSection to encrypt the section if it is not encrypted. Jun 30, 2011 ยท It is possible that the OP in this question is trying to use an App.Config within a dll. In this case, the code is actually trying to access the App.Config of the executable and not the dll. Since the name is not found, you get a Null returned, hence the exception shown. Jan 16, 2026 ยท How to Read Connection String from appsettings.json in .NET Core (C# Step-by-Step Guide) In .NET Core, configuration management is flexible and centralized, replacing the old web.config file with appsettings.json (and environment-specific variants like appsettings.Development.json).
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