Response.Redirect跳转读取数据库的网址

 protected void Page_Load(object sender, EventArgs e)
    {
        form1.Target = "_blank";

    }
    protected void LinkButton3_Click(object sender, EventArgs e)
    {

        SqlConnection oc = new SqlConnection(ConfigurationManager.AppSettings["long"]);
        oc.Open();
        string sql = "select * from url where type='指纹系统'";
        SqlCommand cmd = new SqlCommand(sql, oc);
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
         string   url = dr["weburl"].ToString();    
        Response.Redirect(url);
        // Response.Write(" <script   language= 'javascript '> window.open('url') </script> ");
        }
        else
        {
            Response.Write("<script>alert('没有查到')</script>");
        }
        oc.Close();
  
    }
    protected void LinkButton4_Click(object sender, EventArgs e)
    {

        SqlConnection oc = new SqlConnection(ConfigurationManager.AppSettings["long"]);
        oc.Open();
        string sql = "select * from url where type='远程监控'";
        SqlCommand cmd = new SqlCommand(sql, oc);
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            string url = dr["weburl"].ToString();
            Response.Redirect(url);
        }
        else
        {
            Response.Write("<script>alert('没有查到')</script>");
        }
        oc.Close();
    }