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Each file is uploaded in a chain of chunks.Default chunk size is 100'000 bytes. You can change this size initializing the BufferSize
property. Inside the ProcessStream
method you can get access only to the uploaded chunk, i.e. you should tag the uploading file in order to save it correct. You can preview the RadUpload ChunkTag or how to deal with uploaded files by chunk
article where chunk-tag process is discussed. Please note inside the ProcessStream
method few parameters are prepared and returned to the upload control, because of this if you rip it completely, you should return these parameters too.
Please try the example attached to the mentioned above article and let us know if you have other questions.
the Telerik team