C# Serial Port and DCB using SerialPort Class

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C#

serial-port

COMPort

I have an application that I need to disable parity checking for Serial or Com Ports in Windows XP, Vista, or Windows 7.
I am currently using The .NET Framework SerialPort class
the reason I ask is because I get framing errors because I am changing the parity
fairly quickly and looks to be occurring as bytes are being received by the com port.

NOTE: I have to emulate 9 data bits and the only way to do so with the SerialPort Class is to use mark or space parity.
None, even or odd parity will not work.

I think that using DCB to change fParity to false or 0 would be the best way to solve my issue.

I know my program basically works other than the parity errors that I see with a serial port monitoring program.

Example code segments.

Private Poll1()
{
SerialPort1.Parity=Parity.Mark; // turn on wake up bit
SerialPort1.Write(GenPoll,0,2); // , sends the general poll bytes with wake up bit set
SerialPort1.Parity=Parity.Space; // turn off wake up bit 
int numbytes1 = SerialPort1.BytestoRead; // get the number of bytes to read
Byte[] readbuffer1 = new Byte[numbytes1]; creates a Byte array
SerialPort1.Read(readbuffer1,numbytes1); // read the data.
.......
// processing of received data occurs here. I am thinking about creating another sub // method or procedure to process the received data. 
} // end of Poll

example of sending a
command to the machine

private SendCommand1(Byte[] Command)
{
  SerialPort1.Parity=Parity.Mark;
  SerialPort1.Write(Command,0,1); Address byte
  SerialPort1.Parity=Parity.Space;
  SerialPort1.Write(Command,1,Command.Length-1); command to the machine.
}

[edit]Code block added - OriginalGriff[/edit]