protected void Page_Load(object sender, EventArgs e)
        {
            this.ScriptManager1.RegisterAsyncPostBackControl(this.Button1);
            if(Page.Application["Message"] != null)
                this.Label1.Text = Page.Application["Message"].ToString();
        }
        protected void Button1_Click1(object sender, EventArgs e)
        {
            this.Label1.Text += this.TextBox1.Text;
            Page.Application["Message"] = this.Label1.Text;
            this.UpdatePanel1.UpdateMode = UpdatePanelUpdateMode.Conditional;
            this.UpdatePanel1.Update();
        }