Are you facing the frustrating 'Could Not Copy Obj Debug NetCoreApp2 to Bin Debug' error while working on your .NET Core project? Don't worry, we've got you covered with a few potential solutions to this common issue.

1. Check File Path Length:

The first thing to do is to ensure that the file path length isn't too long. Sometimes, Windows has a limit on the maximum path length, and if it exceeds that limit, you'll encounter this error.

2. Close Open Handles:

If there are any open handles to the files, it can prevent them from being copied. Make sure that there are no other processes or applications holding onto the files within your project.

3. Clean and Rebuild:

Try cleaning your solution and then rebuilding it from scratch. This can help clear any lingering issues that might be causing the error.

4. Clear Bin and Obj Folders:

Manually delete the 'bin' and 'obj' folders within your project directory. Sometimes, these folders can get corrupted or have conflicting files, leading to the error.

5. Exclude Files:

If there are specific files causing the issue, you can try excluding them from the build process temporarily. Once the build is successful, you can investigate the problematic files further.

6. Check File Permissions:

Ensure that you have the necessary permissions to copy files into the 'bin' directory. Sometimes, restrictive permissions can prevent the copying process.

By implementing these solutions, you should be able to troubleshoot and resolve the 'Could Not Copy Obj Debug NetCoreApp2 to Bin Debug' error in your .NET Core project. Remember to document any changes you make and test them thoroughly to ensure that your project continues to function as expected. Good luck!