If you want to use Microsoft FTP Publishing Service for IIS 7.0 with DotNetPanel follow this steps.
Download the installer:
x86 version: http://iis.net/downloads/default.aspx?tabid=34&g=6&i=1619
x64 version: http://www.iis.net/downloads/default.aspx?tabid=34&g=6&i=1620
Read the documentation:
x86 version: http://learn.iis.net/page.aspx/263/installing-and-troubleshooting-ftp7/
x64 version: http://learn.iis.net/page.aspx/263/installing-and-troubleshooting-ftp7/
Run the installer.
Go to Start > Administrative Tools > Internet Information Services (IIS Manager)
Select Sites node > Add FTP Site...
Enter your FTP Site Name. You will be using this name when adding FTP 7 service to your DotNetPanel Server.
Select Application Pools node from IIS Manager and add a new application pool.
Select your FTP site and go to Basic Settings. Select your newly created application pool.
If you want to count the bandwith for your customers select your ftp site and go to FTP Logging. Check "Bytes Sent" and "Bytes Received".