I added a Settings.settings file in one of my library project and I want to use the settings in my ASP.NET application. Unfortunately, the Settings class in Settings.Designer.cs is created as internal sealed partial class so that my ASP.NET application in a different assembly cannot see the class. Fortunately, to make the Settings class public, all I need to to is to go to the properties of Settings.settings file and change the Custom Tool from SettingsSingleFileGenerator to PublicSettingsSingleFileGenerator.