Error the process cannot access the file because it is being used by another process while building project by CLI on .NET Core

Question

I got following error while running dotnet build command on my .NET Core project.

C:\\Program Files\\dotnet\\sdk\\2.1.2\\Microsoft.Common.Curre         


        

Answer 1

So, here I come up with the solution.
There was process running and lock assemblies, since I did dotnet run to run the project through dotnet cli and I did Ctrl + c to terminate the running process. But Ctrl + c didn't killed the all process and Childs continue running and lock assemblies i.e kestrel server was still running on the same port.

To kill the running kestrel server I had run following command.

C:\Users\Kiran>netstat -ano -p TCP | find /I "listening" | find /I "2492"
TCP    127.0.0.1:2492         0.0.0.0:0              LISTENING       820

C:\Users\Kiran>taskkill /F /PID 820
SUCCESS: The process with PID 820 has been terminated.

command you need to run

netstat -ano -p TCP | find /I "listening" | find /I "{your port number}"
taskkill /F /PID {your process ID}

How to manually stop kestrel server

Some references for this issue are:

How to manually stop kestrel server. Question asked on SO

Port localhost:5000 not released causing error System.IO.IOException: Failed to bind to address http://127.0.0.1:5000: address already in use. issue posted on github

terminating dotnet run doesn't terminate child. Issue on github

Windows: How to kill process by port. Blog post

Answer 2

A simple solution in VisualStudio Code is simply to kill the terminal.

Afterwards restart the PowerShell or CMD terminal either by starting a new terminal in the Terminal tab (Terminal - New Terminal) or by using the shortcut Ctrl + Shift + `