Sets the collection to be read-only.
Assembly: System.Configuration (in System.Configuration.dll)
The ProviderCollection class is read/write by default. The method makes the collection read-only. After a collection is set to read-only, some method calls (such as Remove and Add will result in an exception.
Note that most provider-based features will set their ProviderCollection object to read-only after creating instances of all of the configured providers.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.