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how to disable refresh button for browser in asp.net

Hi experts,

I want to block refresh button for browser .
i am using following javascript ,it works for me ,but it is disabling only F5. Please help

if (document.all){
document.onkeydown = function (){
var key_f5 = 116; // 116 = F5

if (key_f5==event.keyCode){
event.keyCode = 27;

return false;
}
}
}

Pratima

refer
http://forums.asp.net/p/1279327/2455531.aspx

private bool _refreshState;
 private bool _isRefresh;

 protected override void LoadViewState(object savedState)
 {
     object[] AllStates = savedState;
     base.LoadViewState(AllStates(0));
     _refreshState = bool.Parse(AllStates(1));
     _isRefresh = _refreshState == Session("__ISREFRESH");
 }

 protected override object SaveViewState()
 {
     Session("__ISREFRESH") = _refreshState;
     object[] AllStates = new object[3];
     AllStates(0) = base.SaveViewState;
     AllStates(1) = !(_refreshState);
     return AllStates;
 }

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SOLUTION