When overridden in a derived class, gets the number of characters in the current System.Text.DecoderFallbackBuffer object that remain to be processed.
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The DecoderFallbackBuffer.Fallback(Byte[], int) method returns true if DecoderFallbackBuffer.Remaining is a nonzero value.
For an exception fallback handler, the DecoderFallbackBuffer.Remaining method should return zero.