Returns a binary format that reads a text value. The {0} specifies the number of bytes to decode, or the binary format of ...

Returns a binary format that reads a text value.  The {0} specifies the number of bytes to decode, or the binary format of the length that preceeds the text.  The optional {1} value specifies the encoding of the text.  If the {1} is not specified, then the encoding is determined from the Unicode byte order marks.  If no byte order marks are present, then TextEncoding.Utf8 is used.