I got new Arduino Uno r3.
Installed Arduino IDE 1.6.5
Installed the required drivers
( It assigned port18 )
Opened Arduino IDE
Selected Arduino Uno/Genuino under boards
Selected com18 under ports
Tried to upload blink example
On first the go of upload, it became idle
On the second go. It showed following error
avrdude: ser_open(): can't open device "\.\COM18": Access is denied.
Please provide me solution