string fileExt = null;
string filePath = fileExt ?? ".txt";

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

//Using Mysql Namespace
using MySql.Data.MySqlClient;
using MySql.Data.Types;
using System.Data;

namespace WindowsFormsApplication2
{
    public class MySqlConn
    {
        #region ===== MySQL Connection =====
        MySqlConnection _conn = new MySqlConnection();
        string _connString = "Server=127.0.0.1;Database=DB명;Uid=계정명;pwd=비밀번호";

        /// 

        /// MySQL 연결
        /// 
        public void MySQLConnection()
        {
            try
            {
                _conn.ConnectionString = _connString;
                _conn.Open();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        /// 

        /// MySQL 연결 해제
        /// 
        public void MySQLDisConnect()
        {
            if (_conn != null)
                _conn.Close();
        }
        #endregion

        public DataSet GetMemberList()
        {
            MySQLConnection();
            string strQuery = "SELECT * FROM Member";
            //_conn.ConnectionString = _connString;

            MySqlCommand cmd = new MySqlCommand();
            cmd.Connection = _conn;

            DataSet ds = new DataSet();
            MySqlDataAdapter da = new MySqlDataAdapter(strQuery, _conn);
            da.Fill(ds, "Member");

            MySQLDisConnect();

            return ds;
        }

        public int SetMemberList(string[] arrParam)
        {
            MySQLConnection();

            string strQuery = "Insert Into Member(EMAIL, KOR_NM, PASSWORD) VALUES(@Email, @KOR_NM, @PWD)";
            //_conn.ConnectionString = _connString;
            
            MySqlCommand InsertCommand = new MySqlCommand();
            
            InsertCommand.Connection = _conn;
            InsertCommand.CommandText = strQuery;

            InsertCommand.Parameters.Add("@Email", MySqlDbType.VarChar, 200);
            InsertCommand.Parameters.Add("@KOR_NM", MySqlDbType.VarChar, 100);
            InsertCommand.Parameters.Add("@PWD", MySqlDbType.VarChar, 100);

            InsertCommand.Parameters[0].Value = arrParam[0];
            InsertCommand.Parameters[1].Value = arrParam[1];
            InsertCommand.Parameters[2].Value = arrParam[2];

            int intResult = InsertCommand.ExecuteNonQuery();

            MySQLDisConnect();

            return intResult;
        }

        public DataSet GetIDCheck(string userID)
        {
            DataSet ds = null;
            string strQuery = "SELECT EMail from Member Where Email='" + userID + "'";
            MySQLConnection();

            MySqlCommand cmd = new MySqlCommand();
            cmd.Connection = _conn;

            ds = new DataSet();
            MySqlDataAdapter da = new MySqlDataAdapter(strQuery, _conn);
            da.Fill(ds, "Memeber");


            MySQLDisConnect();

            return ds;
        }
    }
}