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I want to upload big files per ftp and as I am not able to get the full path for security reasons, I search for a method to create a FileStream for example from a Filechooser WITHOUT already uploading the file.
As far as I understood, when I use PostedFile, it will be already uploaded. As the files are vergy big, this is not the solution I search for.
Is there any solution?
No.
You can’t access to local file from JavaScript, you can’t run server side C# code against client side file system.
You need some sort of client side application to do that. You can use Silverlight/Flash to get a stream as result of file picker dialog and upload files that way. Possible Flash approach covered in ActionScript2: Adding file upload functionality.