c# .net serial port reading data from VT100 terminals ?

in my c# program, I've setup the correct port name, baud rate, stop bits , parity, databits

thought for handshake, I set to none.

in the vt100 terminal, I also set everything to match the c# program. the c# is not receiving any keystroke, but it did receive 0 when I switch on/off the terminal.

any tips is greatly appreciated