Hello Robert Andrews,
For files larger than 4 megabytes ASP.NET and hence RadUpload wont put them into the server's memory but will save them in a temporary location on the server for future use. This mean that you can safely use RadUpload for uploading large files without worrying that it will crash the server. You can verify that this is true if you look at the HttpPostedFile
class with a tool like Reflector.
With respect to your second question, yes, RadUpload returns opened stream pointing to the uploaded file. Example code:
(Stream stream = file.InputStream)
//use the stream that points to the uploaded file
In conclusion, you can safely use RadUpload for large file uploads.
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