Id be really glad to learn how serial com port communication is done using Visual C++.NET and Visual Basic.NET as Im going to create an application where a master desktop/laptop PC communicates Modbus RTU protocol with external slave devices. My (beginners) questions are:

1. How is serial com port communication done using Visual C++.NET and Visual Basic.NET respectively (according to Microsoft)?

2. Which of Visual C++.NET or Visual Basic.NET would be the more suitable language for a serial com port Modbus communication application like this?

3. Is there any comprehensive literature dealing with serial com port communication using Visual C++.NET and Visual Basic.NET (maybe even Modbus specifically)?

4. Are there any good sites where source code for Visual C++.NET and Visual Basic.NET serial com port communication (maybe even Modbus specifically) can be downloaded/bought?