Printing Directly to a default windows printer from a web page

To setup server-side printing you need to ensure the process under which ASP.NET is running has sufficient permissions to access Network printers. By default, ASP.NET runs with the permissions of the local machine (ASPNET account for the ASPNET worker process) account. In order to achieve network printing through IIS (Internet Information Services), the Framework should be run under the local SYSTEM account.

reference:

https://baidharsh.wordpress.com/2012/01/24/how-to-printing-in-iis-using-asp-net/

https://msdn.microsoft.com/en-us/library/aa290045(v=vs.71).aspx

https://forums.asp.net/t/2028689.aspx