The body of a text message contains a string.
After an application creates a text message, the body of the message is readable and writable. The body remains readable and writable after the application sends the message. When an application receives a text message, the body of the message is read-only. If an application calls the Clear Body method of the Message class for C or C++ when the body of a text message is read-only, the body becomes readable and writable. The method also clears the body.