Disable Right Click webpage by JavaScript, ASP.Net

Disable Right Click webpage by JavaScript, ASP.Net

var message = "Disabled";
function clickIE4() {
    if (event.button == 2) {
        alert(message);
        return false;
    }
}
function clickNS4(e) {
    if (document.layers || document.getElementById && !document.all) {
        if (e.which == 2 || e.which == 3) {
            alert(message);
            return false;
        }
    }
}
if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
    document.onmousedown = clickNS4;
} else if (document.all && !document.getElementById) {
    document.onmousedown = clickIE4;
}
document.oncontextmenu = new Function("alert(message);return false");
 

function disableSelection(target){
if (typeof target.onselectstart!="undefined") //For IE
 target.onselectstart=function(){return false}
else if (typeof target.style.MozUserSelect!="undefined") //For Firefox
 target.style.MozUserSelect="none"
else //All other route (For Opera)
 target.onmousedown=function(){return false}
target.style.cursor = "default"
}

Demo Here