Allowed extensions are: .zip,.jpg,.jpeg
Note: 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
Uploading Large Files
Source Code & Description
Client-side Validation
RadUpload provides the client-side function ValidateExtensions,
which validates file extensions on the client. The validation is done by integrating the RadUpload with a
CustomValidator which will prevent the page from submitting when there are selected files
with invalid extensions.
IMPORTANT NOTE: The ControlToValidate property of the
CustomValidator must not be set!
If the validation must be performed server-side, then handle the ServerValidate event
of the CustomValidator in code-behind.