一般处理程序中，禁止缓存的办法！

if (context.Request.UrlReferrer != null)//防止用户直接访问本页面
{

//不让浏览器缓存
            context.Response.Buffer = true;
            context.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
            context.Response.AddHeader("pragma", "no-cache");
            context.Response.AddHeader("cache-control", "");
            context.Response.CacheControl = "no-cache";
            context.Response.ContentType = "text/plain";
            context.Response.ContentEncoding = Encoding.UTF8;
            context.Response.Charset = "UTF-8";
}