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When a stream is initialized, this property is set to zero.
Although you can set the position of the stream beyond the stream's capacity, you will not be able to access that area using the UnmanagedMemoryStream.Read(Byte[], int, int) and UnmanagedMemoryStream.Write(Byte[], int, int) methods. UnmanagedMemoryStream.Read(Byte[], int, int) will return 0 and UnmanagedMemoryStream.Write(Byte[], int, int) will throw a NotSupportedException. This support is primarily for design and code compatibility with basic stream operations.