How to put pictures from my computer onto my iPhone?

It's an iphone 3gs and I'm using a windows computer. I want to put a picture from my computer onto my iPhone. I tried opening my computer files and my iPhone photo folder (i got to it by going to my computer, then clicking my iphone). Every time I try to drag my photo from my computer to my Iphone(with the rest of the pictures) it says something along the lines as "this action is not available." Is there anyway for me to put this picture on my iphone?

Yes there's another way i'm using to put my picture on my iphone. Use your own email. Send picture to your email then open them from your iphone and simply save them to your photos.

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