Question

My first issue: I am trying to establish connection to MySql database, but I keep getting error when I debug it with Visual Studio:”Connection must be valid and open.“

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Threading;
using MySql.Data.MySqlClient;
using MySql.Data.Types; 


public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

        MySqlConnection conn;
        string myConnectionString;
        myConnectionString = "server=localhost;User Id=root;database=test3";
        using (conn = new MySqlConnection(myConnectionString))
        {
            DateTime startTime = DateTime.Now;
            MySqlCommand cmd = new MySqlCommand("SELECT * FROM department");
            // sleep for 2.5s
            Thread.Sleep(2500);

            conn.Open();
            var reader = cmd.ExecuteReader();
            conn.Close();


        }


    }
 }

My second issue: if there a way to display all this on a ASP.NET Web form (I want to leave code on server side), but display data something like ListView or GridView? Thanks in advance

Answer 1

You need to call conn.Open() before using it.