Could not copy "obj\Debug\etc" to "obj\Debug\etc". Exceeded retry count of 10. Failed.

 1. Stop the Running Application

• Make sure your app (yourapp(ur application name)) is not running.
• Open Task Manager (Ctrl+Shift+Esc) → go to Details tab.
• Find yourapp(ur application name)) → End Task.
• Rebuild your project.

2. Clean and Rebuild

• In Visual Studio:
  • Go to Build → Clean Solution
  • Then Build → Rebuild Solution
• This clears the obj and bin folders and rebuilds everything fresh.

3. Check for Debugger/Antivirus Locks

Sometimes, even if the EXE isn’t running:

• Antivirus software may be scanning or locking the file — temporarily disable real-time protection or add your project folder to exceptions.

• Visual Studio Debugger might not have released the file — close the solution and reopen it.

4. Manually Delete Locked Files

If the above doesn’t work:

1. Close Visual Studio.
2. Open File Explorer → navigate to your project folder.
3. Delete the folders:

   bin\Debug
   obj\Debug
   

4. Reopen Visual Studio → Rebuild.

If Windows says “file is in use,” use a tool like Process Explorer:

• Download from Microsoft Sysinternals.

• Search for (yourapp(ur application name)) → right-click → Kill Process.

5. Disable Parallel Builds (Optional)

If your solution has multiple projects:

• Go to Tools → Options → Projects and Solutions → Build and Run
• Set “maximum number of parallel project builds” = 1

This avoids concurrent file access issues.

6. Check Post-Build Events

If you have a post-build script that copies or runs the EXE, ensure it’s not launching the app before the next build.