C#

public partial class DtposMDIParentSystem : Form
{

     List<Object[]> result = new List<Object[]>();
        
     public DtposMDIParentSystem()
     {
          InitializeComponent();

          //create the database connection
            OleDbConnection aConnection = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;
                             Data Source=C:\Users\AP_AE\Desktop\DTPOS_APP\DataBase\DtposDatabase.accdb;");

            //create the command object and store the sql query
            OleDbCommand aCommand = new OleDbCommand("SELECT * FROM Food", aConnection);

            try
            {
                aConnection.Open();

                //create the datareader object to connect to table
                OleDbDataReader reader = aCommand.ExecuteReader();

                int i = 0;
                while (reader.Read())
                {
                    result.Add(new Object[reader.FieldCount]);
                    reader.GetValues(result[i]);
                }
                reader.Close();
                aConnection.Close();
            }
            catch (InvalidOperationException ex)
            {
                MessageBox.Show("Invalid Masseage = " + ex.Message);
            }            
     }
     private void DtposMDIParentSystem_Load(object sender, EventArgs e)
     {
          this.Panel1.Location = new System.Drawing.Point(332, 127);
          this.Panel1.Name = "Panel1";
          this.Panel1.Size = new System.Drawing.Size(700, 560);
     }

     UserControl1 userC = new UserControl();
     //----------------------------------------------------------//
     private void Button1_Click(object sender, EventArgs e)
     {
            this.Panel1.Visible = true;
            this.userC.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.userC.Location = new System.Drawing.Point(0, 0);
            this.userC.Size = new System.Drawing.Size(696, 556);
            this.userC.Enabled = true;
            this.userC.Visible = true;
            this.Panel1.Controls.Add(userC);
     }
}

public partial class UserControl1 : UserControl
{
        public UserControl1()
        {
            InitializeComponent();
        }

        private void UserControl1_Load(object sender, EventArgs e)
        {
            
        }
        
        private void cmdOlives_Click(object sender, EventArgs e)
        {
            if (result.Count > 0)
	        {
	            string temp = "";
                    
	            for (int i = 0; i < result[1].Length; i++)
	            {
	                temp += result[1][i] + "     ";
	            }
	            TableOrderListView.Items.Add(temp);
	        }
        }

        private void cmdSoup_Click(object sender, EventArgs e)
        {

        }
         .
         .
         .
}

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

namespace DtposApplication
{
    public class MenuItems
    {
        private int itemNum = 0;

        public int ItemNum
        {
            get
            {
                return itemNum;
            }
            set
            {
                itemNum = value;
            }
        }

        private string itemName = string.Empty;

        public string ItemName
        {
            get
            {
                return itemName;
            }
            set
            {
                itemName = value;
            }

        }

        private double itemPrice = 0.0;

        public double ItemPrice
        {
            get
            {
                return itemPrice;
            }
            set
            {
                itemPrice = value;
            }
        }

        public void menuitemParam(int ItNo, string nam, double cost)
        {
            itemNum = ItNo;
            itemName = nam;
            itemPrice = cost;
        }

        public void meItem(ref MenuItems mi)
        {
            itemNum = mi.itemNum;
            itemName = mi.itemName;
            itemPrice = mi.itemPrice;
        }
    }
}