This example demonstrates how to upload file without page reload(Ajax file upload). All requests are sent to the server asynchronous through an iframe.
A status information is received in JavaScript Object Notation (JSON, for more information see An Introduction to JavaScript Object Notation (JSON) in JavaScript and .NET. ICallBackEventHandler is used for asynchronous call to the server.
Also this example demonstrates how to display to users an error message during upload. Specifically, the case when need to dispaly an error message about restriction of file size without reading the whole request.
This example allows to upload files with total volume less than 50 MB.

File 1:
File 2:

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