防止页面缓存

<meta http-equiv="pragma"content="no-cache"> 
<meta http-equiv="cache-control"content="no-cache,must-revalidate"> 
<meta http-equiv="expires"content="wed,26feb199708:21:57gmt"> 

response.expires=-1 
response.expiresabsolute=now()-1 
response.cachecontrol="no-cache" 

Response.Expires = -1;
Response.ExpiresAbsolute = DateTime.Now.AddHours(-1);
Response.CacheControl = "no-cache";

header("expires:mon,26jul199705:00:00gmt"); 
header("cache-control:no-cache,must-revalidate"); 
header("pragma:no-cache");