How to check if a port is in use using powershell

If you are using PowerShell Core v6 and above use Test-Connection

>Test-Connection localhost -TcpPort 80
True

Use Get-NetTCPConnection

Get-NetTCPConnection | where Localport -eq 5000 | select Localport,OwningProcess

Localport OwningProcess
--------- -------------
    5000          1684