Hi all
I programmed a FileUpload which is already working fine. Now I'd like to add a feature: At the form where I browse for the file I want to upload, I'd like to validate the file type.
I'd like to allow only image files in the formats .jpg, .gif and .png and show an error message if the file is not valid (= if the format is not allowed)
Does anybody know how i can program this feature?
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