asp.net提示框不弹出，代码也写上，功能能实现就是提示框没反应

  protected void Button1_Click(object sender, EventArgs e)
        {
            if (TextBox1.Text.Trim() == TextBox2.Text.Trim())
            {
                string username = (string)Session["admin"];
                string sql = "update student1 set pass='" + TextBox2.Text.Trim() + "' where stno='" + username + "'";
                SqlHelper.ExecuteNonQuery(sql);
                if (SqlHelper.ExecuteNonQuery(sql) == 1)
                {

                    Response.Write("<script language=javascript>alert('密码修改成功');</" + "script>");  
                }
            }

            else
            {
                Response.Write("<script>alert('密码不一致！');</script>");
            }

调试 断点 看下呗