Hey,
I was just testing/learning with classes and i'm stuck at how to instantiate the class.
I've spent few days trying get myself out of this mess but i don't think i'm getting anywhere.

The picture below shows where I'm stuck at.
The sln file is attached below for reference if needed to.
Please help.
Thanks.

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Your zip folder appears to be empty.
Is IOList a type from the IOHandler class?

Here are the classes in the project.
I paste it here so that it is easier to see.
Thanks.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace TestClass
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TestClass
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            IOHandler.InitializeIOData();

            IOList.X100_On();

            if (IOList.X100)
                MessageBox.Show("Hello");
        }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestClass
{
    public class IOHandler
    {
        public static InputData[] InputCards;
        public class InputData
        {
            public int intCardNo;
            public int intStartingPortNo;
            public string[] strModule = new string[16];
            public string[] strBitName = new string[16];
            public bool[] byteReadBit = new bool[16];

            public InputData()
            {
                int intIndex;

                for (intIndex = 0; intIndex < 16; intIndex++)
                {
                    strBitName[intIndex] = "";
                    strModule[intIndex] = "";
                    byteReadBit[intIndex] = false;
                }
            }
        }

        public static void InitializeIOData()
        {
            int intIndex;
            int CurrentPhysicalCardNo;
            int CurrentVirtualCardNo;
            int CurrentVirtualPortNo;

            InputCards = new InputData[5];
            for (intIndex = 0; intIndex < 5; intIndex++)
            {
                if (InputCards[intIndex] == null)
                {
                    InputCards[intIndex] = new InputData();
                    InputCards[intIndex].intCardNo = 0;
                    InputCards[intIndex].intStartingPortNo = 0;
                }
            }

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

namespace TestClass
{
    class HardwareSettings
    {
    }

    public class IOList
    {
        //Read Input Status
        public static bool X100 = IOHandler.InputCards[0].byteReadBit[0];
        public static bool X101 = IOHandler.InputCards[0].byteReadBit[1];
        public static bool X102 = IOHandler.InputCards[0].byteReadBit[2];
        public static bool X103 = IOHandler.InputCards[0].byteReadBit[3];

        public static void X100_On() {IOHandler.InputCards[0].byteReadBit[0] = true;}
        public static void X101_On() { IOHandler.InputCards[0].byteReadBit[1] = true; }
        public static void X102_On() { IOHandler.InputCards[0].byteReadBit[2] = true; }
        public static void X103_On() { IOHandler.InputCards[0].byteReadBit[3] = true; }
    }
}
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