Я хочу отключить элемент списка переключателей, если текущее системное время больше, чем элемент списка radiobutton.

---

i am facing issue i have radiobutton with different time slot and i want to disable radio button list item if system current time is more than radiobutton list item.

I am getting error input string is not in correct format..

What I have tried:

<pre>  string id = Request.QueryString["id"];
        txtdate.Text = Calendar1.SelectedDate.ToShortDateString();
        Calendar1.Visible = false;
       
      //  DateTime txtMyDate = DateTime.Parse(txtdate.Text);
        SqlConnection cnn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        string Query = "select slot from appoint where selectdate = @date and doc_id='"+id+"'";
        SqlCommand cmd = new SqlCommand(Query, cnn);
        cmd.Parameters.AddWithValue("@date", txtdate.Text);
        DataTable dtAdmin = new DataTable();
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        da.Fill(dtAdmin);
        if (dtAdmin.Rows.Count > 0)
        {
            string[] slots = dtAdmin.Rows.OfType<DataRow>().Select(k => k["slot"].ToString()).ToArray();
            string time = DateTime.Now.ToString("HH:mm tt");

            foreach (ListItem item in RadioButtonList1.Items)
                if (slots.Contains(item.Text) && Convert.ToInt32(item.Text) < Convert.ToInt32(time))
                {
               
                        item.Enabled = false;
                    
                }
                else
                {
                    item.Enabled = true;
                    
                }

        }

---