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