asp.net缓存数据用法

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGridView1();
        }
    }
    /// <summary>
    /// 绑定gridview
    /// </summary>
    public void BindGridView1()
    {
        DataSet ds = new DataSet();
        ds = (DataSet)Cache["MyDataSet"];

        if (ds == null)
        {
            string sql = "select * from tb  order by id desc ";
            ds = OracleHelper.Query(OracleHelper.ConnString, sql);

            Cache["MyDataSet"] = ds;

            CacheMsg.Text = "显式创建的数据集";
        }
        else
        {
            CacheMsg.Text = "从缓存中检索到的数据集";
        }
        this.GridView1.DataSource = ds;
        this.GridView1.DataBind();
    }
    /// <summary>
    /// 清除缓存
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button1_Click(object sender, EventArgs e)
    {
        Cache.Remove("MyDataSet");
        BindGridView1();
    }
    /// <summary>
    /// 插入数据测试 更新后清除缓存
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button2_Click(object sender, EventArgs e)
    {
        Random ra = new Random();
        int id = ra.Next(102, 1000);

        string sql = "insert into tb(id,address,enabled) values(" + id + ",'发怒了','Y')";
        int i = OracleHelper.ExecuteNonQuery(OracleHelper.ConnString, CommandType.Text, sql, null);
        if (i > 0)
        {
            // ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('数据添加成功!缓存已经清除')</script>");
            Cache.Remove("MyDataSet");
            BindGridView1();
        }
    }