The controller for ASPxUploadProgressHandlerPage.ashx was not found or does not implement IController

• Sep 27, 2023

Error Description

This error can occur when you upload a file (in advanced upload mode) for the following controls that use the ASPxUploadProgressHttpHandler:

• ASPxUploadControl.
• ASPxBinaryImage, BootstrapBinaryImage.
• ASPxFileManager, BootstrapFileManager.
• DevExpress.Web.ASPxHtmlEditor.
• Office components: ASPxRichEdit, ASPxSpreadsheet, BootstrapRichEdit, BootstrapSpreadsheet.

Solution

Try one of the following suggestions to overcome this issue:

• Register the ASPxUploadProgressHttpHandler in the web.config file as described in the following help topic: ASPxUploadProgressHttpHandler Registration.

• Add the “*.ashx” file extension to route exceptions in the Global.asax or RouteConfig file if you use routing (for example, the Microsoft.AspNet.FriendlyUrls library).