public static class Class1
    {
        private readonly static System.Web.Caching.Cache cache = System.Web.HttpRuntime.Cache;
        /// <summary>
        /// 根据KEY清除缓存
        /// </summary>
        /// <param name="strCacheKey"></param>
        public static void removeCache(string strCacheKey)
        {
            cache.Remove(strCacheKey);
        }
        /// <summary>
        /// 根据KEY获取缓存中的数据
        /// </summary>
        public static object getCache(string strCacheKey)
        {
            return cache.Get(strCacheKey);
        }
        /// <summary>
        /// 保存数据到缓存
        /// </summary>
        public static void setCache(string strCacheKey, object data)
        {
            cache.Insert(strCacheKey, data, null, DateTime.Now.AddDays(1), TimeSpan.Zero);
        }
    }

public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack)
            {
                return;
            }
            if (Class1.getCache("aa") == null)
            {
                Class1.setCache("aa", "page_load");
            }
        }
protected void btn2_Click(object sender, EventArgs e)
        {
            object obj = Class1.getCache("aa");
            if (obj == null)
            {
                ClientScript.RegisterStartupScript(GetType(), "e", "alert('Not Value');", true);
            }
            else
            {
                ClientScript.RegisterStartupScript(GetType(), "e", string.Format("alert('content:{0}');", obj), true);
            }
        }
    }

public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btn1_Click(object sender, EventArgs e)
        {
            object obj = Class1.getCache("aa");
            if (obj == null)
            {
                ClientScript.RegisterStartupScript(GetType(), "e", "alert('Not Value');", true);
            }
            else
            {
                ClientScript.RegisterStartupScript(GetType(), "e", string.Format("alert('content:{0}');", obj), true);
            }
        }

        protected void btn2_Click(object sender, EventArgs e)
        {
            Class1.setCache("aa", TextBox1.Text);
        }

        protected void btn3_Click(object sender, EventArgs e)
        {
            Class1.removeCache("aa");
        }
    }

public static DataTable _LableAll //所有标签缓存
        {
            get
            {
                if (System.Web.HttpRuntime.Cache["LableAll"] == null)
                {
                    System.Web.HttpRuntime.Cache.Insert("LableAll", GetAllLable(), null, DateTime.Now.AddDays(1), TimeSpan.Zero);      //用来存储所有的标签的内容
                }
                return (DataTable)System.Web.HttpRuntime.Cache["LableAll"];
            }
        }