Serialport.write(Convert.ToChar()) Error

Hi,

When i try to send the as below, I get only 3f,3f,3f........3f. after 126.


SerialPort port = new SerialPort();
port.PortName = strComport;
port.BaudRate = 9600;
port.Handshake = Handshake.None;
port.ReceivedBytesThreshold = 1;
port.RtsEnable = true;
port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.Open();
string newstr = "";

for (int t = 120; t < byte.MaxValue; t++)
{
newstr += Convert.ToChar(t);
}
string newstr = "";
port.Write(newstr);

This same code used to work fine in 1.1 using mscomm32.dll(microsoft
communication controls
Kindly help to solve this problem. Thanks in advance
regards
venkatesh G