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

System.Configuration.ProviderSettingsCollection

Represents a collection of ProviderSettings objects.
namespace System.Configuration { public sealed class ProviderSettingsCollection : ConfigurationElementCollection { public new ProviderSettings this[string key] { get; } public ProviderSettings this[int index] { get; set; } public ProviderSettingsCollection(); public void Add(ProviderSettings provider); public void Remove(string name); public void Clear(); } }