How To Change Listening Port of Apache Server in XAMPP

• Open ~xampp/apache/conf/httpd.conf using any text editor
• look for line with "Listen"
• you should find 'Listen 80' or whichever default port value is set. in my case it's 80 which is in conflict with IIS in my PC. 
• Change 80 to any number which is a port that is available. In my case I changed to 8079
• Look for line with 'ServerName localhost:"
• you should find 'ServerName localhost:80' or whichever default port value is set. In my case it's 80 which is in conflict with IIS in my PC.
• Change 80 to any number which is a port that is available. In my case I changed it to 8079
• Now when accessing html at localhost you need to specify the port
• http://localhost:8079/index.html 
• where index.html is located at xampp/htdocs/index.html