This is the plain text of the current message.
MessageText is the plain text version of the current message, contained in the message XML's "body" child element. The text in this property is automatically escaped to ensure valid XML parsing by the recipient.
By default, the contents of the current message are sent in the <body/> element of the XMPP instant message. If MessageText contains a value, it will be used in place of the message contents. However, this behavior can be controlled by TreatMessageAsHTML, which will treat the message contents as an HTML entity.
This property is not available in the Receiver.