The DecodedText property is used to specify the decoded
value of a string, or return the decoded value of a previously
encoded string. If the property is set, the current plain (decoded)
text is changed to that value and reading the EncodedText
property will return the encoded string for this value. If the
property is read, it will return the decoded value of the
EncodedText property.
The control will use the value of the Encoding property to
determine how the text should be decoded. Note that only base64 and
quoted-printable encoding is supported when decoding a string using
this property. To decode the contents of a file, it's recommended
that you use the DecodeFile method.
This property only supports decoding text which was previously
encoded using the ASCII or UTF-8 character set. If you need to decode
text which used a different character set, you should use the
DecodeText
method in the Mail Message
control. It is a component which is used to create and parse MIME
formatted messages, and it is capable of decoding text that was encoded
using a variety of different character sets.