Are you facing the frustrating issue of not being able to copy obj Debug netcoreapp2 to bin Debug while working with netcoreapp2? Fear not, as we've got some troubleshooting tips to help you solve this pesky problem.

First, ensure that there are no processes running that may be locking the files you're trying to copy. This can often be the cause of such errors. You can use tools like Process Explorer to identify and terminate any processes that may be causing the issue.

Next, check your file permissions. Make sure that you have the proper permissions to access and modify the files in the obj Debug netcoreapp2 directory. Sometimes, incorrect permissions can prevent the copying process from completing successfully.

Another common culprit for this issue is long file paths. Try shortening the file paths by moving your project closer to the root directory. This can often resolve issues related to file path length limitations.

If none of the above solutions work, you may want to consider cleaning and rebuilding your project. Sometimes, corrupted build artifacts can cause issues like this. Use the dotnet clean command to clean your project, and then rebuild it using dotnet build.

Lastly, consider updating your project's dependencies and ensuring that you're using the latest versions of all the necessary packages. Outdated dependencies can sometimes cause strange build issues that can be resolved by updating to the latest versions.

By following these troubleshooting tips, you should be able to resolve the issue of not being able to copy obj Debug netcoreapp2 to bin Debug. Remember to approach each step carefully and systematically, and don't hesitate to consult online forums and communities for additional help. Good luck!