What do you need to simulate? The communication with an external device which is not present during the tests?

Thanks for the reply.The links that you have posted are about the third party software which are used to create a virtual port.My query is that is it possible to design such software on our own in c# in XP.

- First find out which functions and properties of SerialPort you really need (in our case, we just needed a few of them). Create an interface defining them. Create a wrapper for the 'real' port which implements your interface. That will be the instance used in production. Make your other code depend on your interface instead of the 'real' port. Create a dummy port which implements your interface, and add the logic for emulating the device.

That's the instance used for testing. You may create further dummies which simulate communication problems - now you can test that your code copes with that, too. When answering a question please:. Read the question carefully. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.

Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

Both of Acamar links require a comm port on the computer. OP needs a comm port on the computer because the application uses a comm port and that can't be changed. If the application communicates over a serial connection then a comm port is the only way to do it, and the applictions I referred to provide that port. The virtual serial ports that they create can be connected together internally as required to crete the equivalent of a null modem external connection between physical serial ports, which is what OP is tring to do. For example ' Virtual Serial Port Driver creates virtual serial ports and connects them in pairs via virtual null modem cable. Applications on both ends of the pair will be able to exchange data in such a way, that everything written to the first port will appear in the second one and backwards.'

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( The one I use with software that only knows how to communicate over a serial port is which is described as 'The Null-modem emulator allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. Each COM port pair provides two COM ports. The output to one port is the input from other port and vice versa.' That, and others. Solves the problem that OP has in connecting to that application that only understands serial port communication.

Both of Acamar links require a comm port on the computer. OP needs a comm port on the computer because the application uses a comm port and that can't be changed. If the application communicates over a serial connection then a comm port is the only way to do it, and the applictions I referred to provide that port.

The virtual serial ports that they create can be connected together internally as required to crete the equivalent of a null modem external connection between physical serial ports, which is what OP is tring to do. For example ' Virtual Serial Port Driver creates virtual serial ports and connects them in pairs via virtual null modem cable. Applications on both ends of the pair will be able to exchange data in such a way, that everything written to the first port will appear in the second one and backwards.' ( The one I use with software that only knows how to communicate over a serial port is which is described as 'The Null-modem emulator allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. Each COM port pair provides two COM ports. The output to one port is the input from other port and vice versa.'

That, and others. Solves the problem that OP has in connecting to that application that only understands serial port communication.