Car Object, Using array of 10 objects

The Enum is as follows:

public enum Built
{
    Hatch=0,
    Sedan=1,
    Wagon=2,
    Coupe=3
}

The Car Class is as follows:

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

namespace MyCarProject
{
    public class MyCar
    {
        //fields
        #region fields
        private string model;
        private int year;
        private string color;
        private Built built;
        #endregion 

        //properties
        #region properties
        public string Model
        {
            get { return model; }
            set { model = value; }
        }
        public int Year
        {
            get { return year; }
            set { year = value; }
        }
        public string Color
        {
            get { return color; }
            set { color = value; }
        }
        public Built Built
        {
            get { return built; }
            set { built = value; }
        }
        #endregion

        //constructors
        #region constructors
        public MyCar()
        {
        }

        public MyCar(string _model, int _year, string _color, Built _built)
        {
            this.model = _model;
            this.year = _year;
            this.color = _color;
            this.built = _built;
        }
        #endregion

        //methods
        #region methods

        public override string ToString()
        {
            string msg = "";
            msg = "Model : " + this.model + "\n" +
                "Year : " + this.year + "\n" +
                "Color : " + this.color + "\n" +
                "Built : " + this.built;
            return msg;
        }
        #endregion

    }
}

The Form is as follows:

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 MyCarProject
{
    public partial class Form1 : Form
    {
        //fields
        #region fields
        private MyCar[] carArray = new MyCar[10];
        #endregion

        //properties
        #region properties
        public MyCar[] CarArray
        {
            get { return carArray; }
            set { carArray = value; }
        }

        #endregion

        //constructors
        #region constructors
        public Form1()
        {
            InitializeComponent();
        }
        #endregion

        //methods-events
        #region methods-events
        private void Form1_Load(object sender, EventArgs e)
        {
            //add Built items into combobox
            cmbBuilt.Items.Add(Built.Coupe);
            cmbBuilt.Items.Add(Built.Hatch);
            cmbBuilt.Items.Add(Built.Sedan);
            cmbBuilt.Items.Add(Built.Wagon);
        }

        public bool addCar(MyCar obj)
        {
            for (int i = 0; i < carArray.Length; i++)
            {
                if (carArray[i] == null)
                {
                    carArray[i] = obj;
                    return true;
                }
            }
            
            return false;
        }

        public MyCar searchByModel(string _model)
        {
            for (int i = 0; i < carArray.Length; i++)
            {
                if (_model == carArray[i].Model)
                {
                    return carArray[i];
                }
            }
            return null;
        }

        public bool updateCar(string _model, MyCar obj)
        {
            for (int i = 0; i < carArray.Length; i++)
            {
                if ((_model == carArray[i].Model) && (carArray[i] != null))
                {
                    carArray[i] = obj;  //update car object
                    return true;
                }
            }
            return false;
        }

        public bool deleteCar(string _model)
        {
            for (int i = 0; i < carArray.Length; i++)
            {
                if ((carArray[i].Model == _model) && (carArray[i] != null))
                {
                    carArray[i] = null;
                    return true;
                }
            }
            return false;
        }

        public string displayAllCars()
        {
            string msg = "";
            for (int i = 0; i < carArray.Length; i++)
            {
                if (carArray[i] != null)
                {
                    msg += carArray[i].ToString() + "\n\n";
                }
            }
            return msg;
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            //read gui
            MyCar carObj = new MyCar();

            try
            {
                carObj.Model = txtModel.Text;
                carObj.Year = int.Parse(txtYear.Text);
                carObj.Color = txtColor.Text;
                carObj.Built = (Built)cmbBuilt.SelectedItem;

                bool boolAdd = addCar(carObj);
                if (boolAdd == true)
                {
                    MessageBox.Show("Car successfully added.");
                }
                else
                {
                    MessageBox.Show("Car NOT added. Car Array might be full.");
                }
            }
            catch   //parsing error
            {
                MessageBox.Show("Please fill all appropriate fields with correct values");
            }

        }

        private void btnSearch_Click(object sender, EventArgs e)
        {
            try
            {
                MyCar obj = searchByModel(txtModel.Text);

                if (obj != null) //car found
                {
                    txtYear.Text = "" + obj.Year;
                    txtColor.Text = "" + obj.Color;
                    cmbBuilt.SelectedItem = obj.Built;
                    MessageBox.Show("Car found");
                }
                else
                {
                    MessageBox.Show("Car not found");
                }
                    
            }
            catch
            {
                MessageBox.Show("Please enter a valid model name");
                txtModel.Focus();
            }
        }

        private void btnUpdate_Click(object sender, EventArgs e)
        {

            try
            {
                MyCar car = new MyCar();
                car.Model = txtModel.Text;
                car.Year = int.Parse(txtYear.Text);
                car.Color = txtColor.Text;
                car.Built = (Built)cmbBuilt.SelectedItem;

                bool boolUpdate = updateCar(car.Model, car);

                if (boolUpdate == true)
                {
                    MessageBox.Show("Update Completed");
                }
                else
                {
                    MessageBox.Show("Update Failed");
                }
            }
            catch
            {
                MessageBox.Show("Could not perform update");
            }

        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            try
            {
                bool boolDelete = deleteCar(txtModel.Text);

                if (boolDelete == true)
                    MessageBox.Show("Delete Completed");
                else
                    MessageBox.Show("Delete Failed");
            }
            catch
            {
                MessageBox.Show("Could not perform delete");
            }


                    
        }

        private void btnDisplayAll_Click(object sender, EventArgs e)
        {
            string carList = displayAllCars();

            if (carList != "")
            {
                MessageBox.Show(carList);
            }
            else
            {
                MessageBox.Show("No cars available to display");
            }
        }
        #endregion
    }
}