how to upload image when i m login through facebook

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C#

hello friend ,

i m working on a website in which we are providing image uploading but when user clicking button upload then i m opening a ajax model popup window in which i m checking that user is logged in my website or not.if not then we are providing logging through facebook id or login panel in model pop up window of Ajax.

problem is that when user login through facebook then i want to upload image which is selected by user in file uploader.

if any body have any idea about it please reply me

Thanks & Regards.
Gulam Hussain