Pre-Test :)

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 myPreTest
{
    public partial class Form1 : Form
    {
        int iMin = 0;
        int iMax = 0;
        string[] sCarModel = { "Dodge Viper", "Ford Mustang", "Ford Thunderbird", "Pontiac Grandprix", "Ford Windstar", "Dodge RAM Van", "Blue Bird Mini Bus" };
        int[] iMaxStringNo = { 2, 3, 4, 6, 8, 10, 16 };

        public Form1()
        {
            InitializeComponent();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Do you really want to close the application?", "Exiting Application", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                Close();
            }
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnFindCar_Click(object sender, EventArgs e)
        {
            if (CheckAllFields()) //all fields are valid
            {
                try
                {
                    iMin = int.Parse(txtMin.Text);
                    iMax = int.Parse(txtMax.Text);

                    for (int i = 0; i < sCarModel.Length; i++)
                    {
                        if ((iMaxStringNo[i] <= iMax) && (iMaxStringNo[i] >= iMin))
                        {
                            string sModelandMax = "" + sCarModel[i] + " - Max: " + iMaxStringNo[i] + " people";
                            lisModels.Items.Add(sModelandMax);
                        }
                    }
                }
                catch
                {
                    MessageBox.Show("Please enter a integer values for Maximum and Minimum fields", "Integer values required", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                }

            }
            

            
        }

        /******************************* FUNCTION LIST *****************************/
        private bool CheckAllFields()
        {
            if (txtCustomerName.Text == "")
            {
                MessageBox.Show("Please enter a customer name", "Customer Name missing", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtCustomerName.Focus();
                return false;
            }
            else if ((txtCustomerName.Text.Contains("0"))||(txtCustomerName.Text.Contains("1"))||(txtCustomerName.Text.Contains("2"))||(txtCustomerName.Text.Contains("3"))||(txtCustomerName.Text.Contains("4"))||(txtCustomerName.Text.Contains("5"))||(txtCustomerName.Text.Contains("6"))||(txtCustomerName.Text.Contains("7"))||(txtCustomerName.Text.Contains("8"))||(txtCustomerName.Text.Contains("9")))
            {
                MessageBox.Show("Please enter a customer name with Alphabets only", "Customer Name error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                txtCustomerName.Focus();
                return false;
            }
            else if (txtMin.Text == "")
            {
                MessageBox.Show("Please enter Minimum passengers", "Minimum Passengers number missing", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtMin.Focus();
                return false;
            }
            else if (txtMax.Text == "")
            {
                MessageBox.Show("Please enter Maximum passengers", "Maximum Passengers number missing", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtMax.Focus();
                return false;
            }
            else
            {
                return true;
            }
        }

        private void btnReserveCar_Click(object sender, EventArgs e)
        {
            try
            {
                if (CheckAllFields() == true)
                {
                    if (lisModels.Text != "")
                    {
                        string sResult = "Customer Name: " + txtCustomerName.Text + "\n" +
                            "Number of Passengers requested: " + iMin + " Minimum, " + iMax + " Maximum\n" +
                            "Selected Car: " + lisModels.Text;

                        MessageBox.Show(sResult, "Reservation Made", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        
                        lblReservations.Text += DateTime.Now.ToShortDateString().ToString() + "\n" + sResult + "\n\n";
                    }
                    else
                    {
                        MessageBox.Show("Please choose a car model", "No car model selected", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
            catch
            {
                MessageBox.Show("Unable to make reservation - Please check all input", "Error in Reservation", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

    }
}