How to clear browser history when login time?

<META Http-Equiv="Cache-Control" Content="no-cache"/>
 <META Http-Equiv="Pragma" Content="no-cache"/> 
<META Http-Equiv="Expires" Content="0"/>


protected void LogOut()
 {    
  Session.Abandon();
 string loggedOutPageUrl = "Logout.aspx"; 
     Response.Write("");
 }

public void ClearCacheItems() 
{
 List keys = new List(); 
   IDictionaryEnumerator enumerator = Cache.GetEnumerator();    
  while (enumerator.MoveNext())   
   keys.Add(enumerator.Key.ToString());   
   for (int i = 0; i < keys.Count; i++)   
    Cache.Remove(keys[i]); 
}