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The solution is to ensure the OPC .NET API is correctly installed, either by reinstalling the application, re-running the SDK installer, or explicitly adding the NuGet package reference to your project.
The DLL is missing from the application’s execution directory, or the system lacks the correct Microsoft Visual C++ Redistributable packages required by the underlying COM components. ClassNotRegistered (REGDB_E_CLASSNOTREG)
Always remember these key takeaways:
Understanding OpcNetApi.dll: The Backbone of .NET OPC Classic Communications

The solution is to ensure the OPC .NET API is correctly installed, either by reinstalling the application, re-running the SDK installer, or explicitly adding the NuGet package reference to your project.
The DLL is missing from the application’s execution directory, or the system lacks the correct Microsoft Visual C++ Redistributable packages required by the underlying COM components. ClassNotRegistered (REGDB_E_CLASSNOTREG) opcnetapidll
Always remember these key takeaways:
Understanding OpcNetApi.dll: The Backbone of .NET OPC Classic Communications The solution is to ensure the OPC