In the case login unsuccessfully, display "You are not allowed to access this function!"
2. Check if login successfully, search all items with 3 conditions: CosmeticName, CosmeticSize or SkinType (using relative search). Search results need to be grouped by CosmeticName, CosmeticSize and SkinType.
3. Check if login successfully, delete the selected item with the confirmation then update the list of items.
4. Check if login successfully, add new item with the requirements:
The new item will display at the top of the list.
All fields are required.
Value for CosmeticName includes a-z, A-Z, space, @, # and digit 0-9. Each word of the CosmeticName must begin with the capital letter.
Value for DollarPrice > 0.
The value for CosmeticName and CosmeticSize must be 2-80 characters.
5. Check if login successfully, update existing item with the same requirements with add function.
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