protected void Button1_Click(object sender, EventArgs e)
    {
        this.GridView1.DataSource = dv;
        this.GridView1.DataBind();
        //Response.Write("ok");
        System.Threading.Thread.Sleep(5000);
        StringBuilder str = new StringBuilder();
        str.Append("a");
        str.Append("  b");
        Response.Write(str);
        
    }
预期结果:按钮点击后先显示GridView1数据,sleep(5000)后显示str//
现在情况:按钮点击后5S后GridView1中数据同str一并显示//
请路过的朋友看看如何解决//