Use the ShowProgressPanel property to specify whether the progress panel (which contains the progress bar and cancel button) is visible within the ASPxUploadControl.
The ASPxUploadProgressHttpHandler is required for the ASPxUploadControl‘s progress panel to function properly. This handler is automatically added to a web project’s Web.Config file when setting the ShowProgressPanel property to true within the ASPxUploadControl‘s smart tag. If you enable the ShowProgressPanel property via code, you should manually register the ASPxUploadProgressHttpHandler within the Web.Config file.
Note
If you are experiencing the “Access is denied” or “Permission Denied” error during large file uploads to the IIS 5.x or Cassini Web Server, we recommend that you execute the following command at the server, to work around the problem:
%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/security/requestFiltering -requestLimits.maxAllowedContentLength:<new-request-length>
Here, <new-request-length> is the new, larger value of the request length.
This sample demonstrates how to use the ASPxUploadControl, and how to pass a file name that was saved on the server to the client, by using the server-side and client-side FileUploadComplete events.