Solved! Application open problem

Oct 5, 2018
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When open the application windows shows " there is no com port! Please check out the line correction and device driver installation
 

Most modern computers (laptops specifically) do not have serial ports. vb.net is not an application, it is a Microsoft environment for creating applications, so it is up to the application you're trying to run to handle serial ports.

@helpstar - your links have nothing to do with OP' problem.