How to create an array of webbrowser?

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C#

I want to create an array of we browsers so I can create a tabbed Webbrowser the problem is when I Create web browser like this webbrowser [] IB = new webbrowser [100]; and then start designing the one of the array like this IB[1].dock=dockstyle.fill When i build I get no error and every thing is cool; but when I start the program it gives an error that I have a problem with Ib[1].dock=dockstyle.fill so please help thanks

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 Mafia_IB___12
{
    public partial class Mafia_IB : Form
    {
        public Mafia_IB()
        {
            InitializeComponent();
        }
       
        
        WebBrowser[] IB ;

        private void Mafia_IB_Load(object sender, EventArgs e)
        {
            IB = new WebBrowser[100];
              Tabs ta = new Tabs();         
            int ibx=this.Size.Width - 10 , iby = this.Size.Height-10;
            int x = this.Left = Screen.PrimaryScreen.WorkingArea.Left, y = this.Top = Screen.PrimaryScreen.WorkingArea.Bottom - this.Height / 2;
            int x1 = this.Left = Screen.PrimaryScreen.WorkingArea.Right - backward.Width, y1 = this.Top = Screen.PrimaryScreen.WorkingArea.Bottom - this.Height / 2;
            int xrest = (this.Width - 1100) / 5;
            backward.Location = new Point(x, y);
            Forward.Location = new Point(x1, y1);
            IB[1].Size = new Size(ibx, iby);
            IB[1].Location = new Point(5, 5);
            tools.Dock = DockStyle.Bottom;
            tools.Width = Screen.PrimaryScreen.WorkingArea.Width;
            Gostrip.Width = xrest;
            refreshstrip.Width = xrest;
            Homestrip.Width = xrest;
            Pinstrip.Width = xrest;
            forwardstrip.Width = xrest;
            //tools.Visible = false;
            Loading.Width = this.Width;
            IB[1].Show();
            IB[1].Dock = DockStyle.Fill;
            IB[1].ProgressChanged+=new WebBrowserProgressChangedEventHandler(IB_ProgressChanged);
            IB[1].DocumentCompleted+=new WebBrowserDocumentCompletedEventHandler(IB_DocumentCompleted);
         
            
            
        }