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If a class derived from System.IO.Stream does not support reading, calls to the BufferedStream.Read(Byte[], int, int), BufferedStream.ReadByte, Stream.BeginRead(Byte[], int, int, AsyncCallback, object), Stream.EndRead(IAsyncResult), and the Peek methods of System.IO.StreamReader, System.IO.StringReader, and System.IO.TextReader throw a NotSupportedException.
If the stream is closed, this property returns false.