I have read the MSDN topic "How to: Dial Modems Attached to Serial Ports in Visual Basic". Here only the dial command and the phone number is given. My question is when I send the user name and the password And in response what output I will get
You would need to read up on modem commands and send those commands in using the write just as you do for the dial command. This related to System.IO. Plese post this query to .NET base class library forum.