Sharepoint: How to turned on Developer Dashboard using Powershell

Step 1 : Start Powershell
(Windows 7)

Start>All Programs>Microsoft Sharepoint 2010 Products>Sharepoint 2010
Management Shell​

Step 2: Type following commands

stsadm -o setproperty -pn developerdashboard -pv on

stsadm -o setproperty -pn developerdashboard -pv off

stsadm -o setproperty -pn developerdashboard -pv ondemand