I connect the external modem to the pc with serial port.
so i want to connect server through dial-up method with C#.
And then, send and receive message.
How can i solve this problem? please.
Can I use serialport component of .NET?
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Yes.
You’ll need to find out from the server specs what type of message to send, but yes, you would use the SerialPort object.
Here’s a starting point for you.
http://www.dreamincode.net/forums/showtopic35775.htm
And the Bing search I used to find it.
http://www.bing.com/search?q=C%23+modem+communications+via+serialport&src=IE-SearchBox&FORM=IE8SRC