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Suppose one user store flower.jpg image and then second user storing different file but with same name flower.jpg, will the first image is replace by second one?
Possible. But, you can store it for different user.
Example: (for user1) The images will be stored in the path Images\Users\User1
(for user2) The images will be stored in the path Images\Users\User2
or something like that..
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If both image will store with same name then how can i recognize which image is upload by which user.
It is how you design your database for you to find it out. Primary key will help I think.