How to create script to restart DNS Server and do it automatically.

You can restart your DNS Service by going into the DNS Server.
However depending on environment some servers may require daily or even hourly DNS refresh to maintain a clean Server and reduce any DNS issues you may have.

The best way to do this is by creating a batch file and set it up on Schedule Tasks.

Open Notepad
Type in the following:
Net stop "dns server"
Net start "dns server"

Save the Notepad as .cmd (drop-down all files)

Search and open Task Schedule
Click on Create Task
On the Action Tab select "new"
Browse the batch file
Set the conditions
On the Trigger Tab select "new"

Here you can set up batch to be triggered Daily/Weekly/Monthly as Schedule
You can also Trigger the task by various other option.
My favourite "on disconnect from user session" since our clients uses remote access to work, so every time they log off the DNS refreshes for the next remote access.