Gets a value indicating whether the collection is read-only.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
A read-only collection does not allow the addition, removal, or modification of elements after the collection is created.
A read-only collection is simply a collection with a wrapper that prevents modifying the collection. If changes are made to the underlying collection, the read-only collection reflects those changes.
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.