. net file upload vulnerability in the code example and solution-vulnerability warning-the black bar safety net

At this point in the test when stripped down the code and some lost, and only a patch solution. We make do and see. Something very simple. string str = filename. Substringfilename. LastIndexOf"." + 1, 3; if str == "png" || str == "gif" || str == "jpg" || str == "jpeg" || str == "PNG" || str ==...