Prohibit using F5 refresh

Add the following JavaScript to the header part or under <asp:Content > tag.


		function checkKeyCode(evt) {
			var evt = (evt) ? evt : ((event) ? event : null);
			var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
			if (event.keyCode == 116) {
			evt.keyCode = 0;
			return false
			}
		}
		document.onkeydown = checkKeyCode;

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