C# System.NullReferenceException

Hello everyone

I have a problem and I don't know what to do with it, none of the answers worked.

As the title says, it's a System.NullReferenceException

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace Game
{
    class Launcher:Form
    {
        private static IniFile inif = new IniFile("game.ini");

        [DllImport("user32.dll")]
        public static extern bool EnumDisplaySettings(
              string deviceName, int modeNum, ref DEVMODE devMode);
        const int ENUM_CURRENT_SETTINGS = -1;
        private ListBox listBox1;
        private Button button1;

        const int ENUM_REGISTRY_SETTINGS = -2;

        [StructLayout(LayoutKind.Sequential)]
        public struct DEVMODE
        {

            private const int CCHDEVICENAME = 0x20;
            private const int CCHFORMNAME = 0x20;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmDeviceName;
            public short dmSpecVersion;
            public short dmDriverVersion;
            public short dmSize;
            public short dmDriverExtra;
            public int dmFields;
            public int dmPositionX;
            public int dmPositionY;
            public ScreenOrientation dmDisplayOrientation;
            public int dmDisplayFixedOutput;
            public short dmColor;
            public short dmDuplex;
            public short dmYResolution;
            public short dmTTOption;
            public short dmCollate;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmFormName;
            public short dmLogPixels;
            public int dmBitsPerPel;
            public int dmPelsWidth;
            public int dmPelsHeight;
            public int dmDisplayFlags;
            public int dmDisplayFrequency;
            public int dmICMMethod;
            public int dmICMIntent;
            public int dmMediaType;
            public int dmDitherType;
            public int dmReserved1;
            public int dmReserved2;
            public int dmPanningWidth;
            public int dmPanningHeight;

        }

        public static void Main(string[] args)
        {
            using (Launcher launchf = new Launcher())
            {
                launchf.LoadData();
                launchf.Show();
            }
        }

        private void LoadData()
        {
            List<string> reslist = new List<string>();
            DEVMODE vDevMode = new DEVMODE();
            int i = 0;
            while (EnumDisplaySettings(null, i, ref vDevMode))
            {
                reslist.Add(vDevMode.dmPelsWidth + "x" + vDevMode.dmPelsHeight);
                i++;
            }
            listBox1.DataSource = reslist;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            inif.DeleteKey("resx", "Display");
            inif.DeleteKey("resy", "Display");
            string res = listBox1.GetItemText(listBox1.SelectedItem);
            string resx = res.Split('x').First();
            string resy = res.Split('y').Last();
            inif.Write("resx", resx, "Display");
            inif.Write("resy", resy, "Display");
        }

        private void InitializeComponent()
        {
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // listBox1
            // 
            this.listBox1.FormattingEnabled = true;
            this.listBox1.Location = new System.Drawing.Point(492, 12);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(120, 199);
            this.listBox1.TabIndex = 0;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(537, 406);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 2;
            this.button1.Text = "Save";
            this.button1.UseVisualStyleBackColor = true;
            // 
            // Launcher
            // 
            this.ClientSize = new System.Drawing.Size(624, 441);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.listBox1);
            this.Name = "Launcher";
            this.ResumeLayout(false);

        }
    }
}

The exception is trown at "listBox1.DataSource = reslist;", while the array reslist has 63 members.

Can someone please help me with it?