<PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.2" />

System.Configuration.SettingsLoadedEventHandler

public sealed delegate SettingsLoadedEventHandler : MulticastDelegate
Represents the method that will handle the SettingsLoaded event.
public SettingsLoadedEventHandler(object object, IntPtr method)

public virtual IAsyncResult BeginInvoke(object sender, SettingsLoadedEventArgs e, AsyncCallback callback, object object)

public virtual void EndInvoke(IAsyncResult result)

public virtual void Invoke(object sender, SettingsLoadedEventArgs e)