Modbus communication between a Delta PLC and a C# program

Hello everyone,
I want to establish a Modbus communication between a Delta PLC and a C# program. So, I've downloaded the sample c# project from the delta website. But, I can't figure out the C# sample how to work. On the other hand, the VB sample correctly works by virtual port and ModRSsim software.
Could someone please guide me on how to use the C# project correctly?

https://delta-ia-tips.com/2012/03/27/pc-plc-communication-plc-control-without-scada/

Please see the attached file.
 

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