Gets a value which indicates if data can be written to the socket without blocking.
Returns true if data can be written to the socket; otherwise returns false.
The IsWritable property returns true if data can be written to the socket without blocking. For non-blocking sockets, this property can be checked before the application attempts to write data to the socket. Note that even if this property does return true indicating that data can be written to the socket, applications should always check the return value from the Write method.