The largest allowed combined file size for upload in this example is 100MB. This is specified by the
maxRequestLength="102400" set in Web.config file. If you attempt to upload files with total size greater that 100MB
you will get "Page Not Found" error. For more information about uploading large files visit the help article
Custom Validation
RadUpload provides the server-side event ValidatingFile,
which can be used to define custom validation logic and to override the internal validation
if needed.
The SkipInternalValidation property of event arguments is used to
disable the internal validation for the specific file.
When a file is validated, the IsValid
property of the event arguments must be set according the result of the
validation.
After custom validation is performed on ValidatingFile, the valid files can be later accessed
using the UploadedFiles property and the invalid files using the InvalidFiles property if needed.