ASP. NET Web Application project

ASP. NET Web Application project

. ashx

. Ashx.cs

ASPX includes the foreground code to process, ASHX can be seen as a background. cs file without the foreground code in the ASPX page.
Without the foreground code, the server is less affordable and responds faster than ASPX

Ashx simple, ashx execution is earlier than ASPX, no foreground page, reduced control tree generation

ASHX file is called "General processing Files", this file is not with the foreground interface, will not generate and will not bring any HTML foreground code, only do generally receive data processing data or return pure strings (such as JSON string), so this file will only have one.
Model, data models 
JSON data type
Writes serialized data to the body of an HTTP response message
http://localhost:xxxx/api/products/

ASP. NET Web Application project