Microsoft Windows Networking: Creating a Client Server Application

	Creating a Client Server Application

Practical Learning: Creating the Employees

To add a new class to the project, in the Class View, right- click BethesdaCarRental1 -> Add -> Class...

Set the Class Name to Employee and click Add

Change the Employee.cs file as follows:

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

namespace BethesdaCarRental1
{
    [Serializable]
    public class Employee
    {
    public string FirstName;
        public string LastName;
        public string Title;
        public double HourlySalary;

        // This constructor completely defines an employee
        public Employee(string fname = "Unknown",
                        string lname = "Unknown",
                        string title = "Employee",
                        double salary = 0.00d)
        {
            FirstName = fname;
            LastName = lname;
            Title = title;
            HourlySalary = salary;
        }

        public string FullName
        {
            get { return LastName + ", " + FirstName; }
        }
    }
}

To add another form to the application, in the Solution Explorer, right- click BethesdaCarRental1 -> Add -> Windows Form...

Set the Name to EmployeeEditor and click Add

Design the form as follows:

Control	Text	Name	Properties
Label	&Employee #:
MaskedTextBox		txtEmployeeNumber	Mask: 00-000 Modifiers: public
Label	First Name:
TextBox		txtFirstName	Modifiers: public
Label	Last Name:
TextBox		txtLastName	Modifiers: public
Label	Full Name:
TextBox		txtFullName	Enabled: False Modifiers: public
Label	Title:
TextBox		txtTitle	Modifiers: public
Label	Hourly Salary:
TextBox		txtHourlySalary	Modifiers: public TextAlign: Right
Button	OK	btnOK	DialogResult: OK
Button	Cancel	btnCancel	DialogResult: Cancel
Form			AcceptButton: btnOK CancelButton: btnCancel FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

Click the Last Name text box

In the Properties window, click the Events button and double-click Leave

Implement the event as follows:

// This code is used to create and display the customer's full name
private void txtLastName_Leave(object sender, EventArgs e)
{
    string strFirstName = txtFirstName.Text;
    string strLastName = txtLastName.Text;
    string strFullName;

    if (strFirstName.Length == 0)
        strFullName = strLastName;
    else
        strFullName = strLastName + ", " + strFirstName;

    txtFullName.Text = strFullName;
}

To add a new form to the application, in the Solution Explorer, right-click BethesdaCarRental1 -> Add -> Windows Form...
Set the Name to Employees and click Add
From the Toolbox, add a ListView to the form

While the new list view is still selected, in the Properties window, click the ellipsis button of the Columns field and create the columns as follows:

(Name)	Text	TextAlign	Width
colEmployeeNumber	Empl #		45
colFirstName	First Name		65
colLastName	Last Name		65
colFullName	Full Name		140
colTitle	Title		120
colHourlySalary	Hourly Salary	Right	75

Design the form as follows:

Control	Text	Name	Other Properties
ListView		lvwEmployees	Anchor: Top, Bottom, Left, Right FullRowSelect: True GridLines: True View: Details
Button	New Employee...	btnNewEmployee	Anchor: Bottom, Right
Button	Close	btnClose	Anchor: Bottom, Right

Double-click an unoccupied area of its body

Change the file 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;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace BethesdaCarRental
{
    public partial class Employees : Form
    {
        // This is the list of employees
        Dictionary<string, Employee> ListOfEmployees;

        public Employees()
        {
            InitializeComponent();
        }

        internal void ShowEmployees()
        {
            if (ListOfEmployees.Count == 0)
                return;

            // Before displaying the employees, empty the list view
            lvwEmployees.Items.Clear();
            // This variable will allow us to identify the odd and even indexes
            int i = 1;

            // Use the KeyValuePair class to visit each key/value item
            foreach (KeyValuePair<string, Employee> kvp in ListOfEmployees)
            {
                // Create a list view item
                ListViewItem lviEmployee = new ListViewItem(kvp.Key);

                Employee empl = kvp.Value;

                lviEmployee.SubItems.Add(empl.FirstName);
                lviEmployee.SubItems.Add(empl.LastName);
                lviEmployee.SubItems.Add(empl.FullName);
                lviEmployee.SubItems.Add(empl.Title);
                lviEmployee.SubItems.Add(empl.HourlySalary.ToString("F"));

                if (i % 2 == 0)
                {
                    lviEmployee.BackColor = Color.FromArgb(255, 128, 0);
                    lviEmployee.ForeColor = Color.White;
                }
                else
                {
                    lviEmployee.BackColor = Color.FromArgb(128, 64, 64);
                    lviEmployee.ForeColor = Color.White;
                }

                lvwEmployees.Items.Add(lviEmployee);

                i++;
            }
        }

        private void Employees_Load(object sender, EventArgs e)
        {
            ListOfEmployees = new Dictionary<string, Employee>();
            BinaryFormatter bfmEmployees = new BinaryFormatter();

            // This is the file that holds the list of parts
            string strFilename = @"\\EXPRESSION\Bethesda Car Rental\Employees.cre";

            if (File.Exists(strFilename))
            {
                FileStream stmEmployees = new FileStream(strFilename,
                                                         FileMode.Open,
                                                         FileAccess.Read,
                                                         FileShare.Read);

                try
                {
                    // Retrieve the list of employees from the file
                    ListOfEmployees = (Dictionary<string, Employee>)bfmEmployees.Deserialize(stmEmployees);
                }
                finally
                {
                    stmEmployees.Close();
                }
            }

            ShowEmployees();
        }
    }
}

Return to the Employees form and double-click the New Employee button

Implement its event as follows:

private void btnNewEmployee_Click(object sender, EventArgs e)
{
    EmployeeEditor editor = new EmployeeEditor();

    // Show the Employee Editor
    if (editor.ShowDialog() == DialogResult.OK)
    {
        if (editor.txtEmployeeNumber.Text == "")
        {
            MessageBox.Show("You must provide an employee number",
                            "Bethesda Car Rental",
                            MessageBoxButtons.OK, MessageBoxIcon.Information);
            return;
        }

        if (editor.txtLastName.Text == "")
        {
            MessageBox.Show("You must provide the employee's last name",
                            "Bethesda Car Rental",
                            MessageBoxButtons.OK, MessageBoxIcon.Information);
            return;
        }

        string strFilename = @"\\EXPRESSION\Bethesda Car Rental\Employees.cre";

        Employee empl = new Employee();

        empl.FirstName = editor.txtFirstName.Text;
        empl.LastName = editor.txtLastName.Text;
        empl.Title = editor.txtTitle.Text;
        empl.HourlySalary = double.Parse(editor.txtHourlySalary.Text);
        ListOfEmployees.Add(editor.txtEmployeeNumber.Text, empl);

        FileStream bcrStream = new FileStream(strFilename,
                                              FileMode.Create,
                                              FileAccess.Write,
                                              FileShare.Write);
        BinaryFormatter bcrBinary = new BinaryFormatter();
        bcrBinary.Serialize(bcrStream, ListOfEmployees);
        bcrStream.Close();

        ShowEmployees();
    }
}

Display the Central form

Double-click the Employees button and implement its event as follows:

private void btnEmployees_Click(object sender, EventArgs e)
{
    Employees dlgEmployees = new Employees();
    dlgEmployees.ShowDialog();
}

To save the project, on the Standard toolbar, click the Save All button

Practical Learning: Creating the Customers

To add a new class to the project, in the Class View, right-click BethesdaCarRental1 -> Add -> Class...
Set the Class Name to Customer and click Finish

Change the Customer.cs file as follows:

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

namespace BethesdaCarRental1
{
    [Serializable]
    public class Customer
    {
        public string FullName;
        public string Address;
        public string City;
        public string State;
        public string ZIPCode;

        // This constructor defines a customer
        public Customer(string fName = "John Unknown",
                        string adr = "123 Main Street",
                        string ct = "Great City",
                        string ste = "AA",
                        string zip = "00000-0000")
        {
            FullName = fName;
            Address = adr;
            City = ct;
            State = ste;
            ZIPCode = zip;
        }
    }
}

To add another form to the application, on the main menu, click Project -> Add Windows Forms
Set the Name to CustomerEditor and click Add

Design the form as follows:

Control	Text	Name	Properties
Label	Driver's Lic. #:
TextBox		txtDrvLicNbr	Modifiers: Public
Label	State:
ComboBox		cbxStates	Modifiers: Public Items: AL, AK, AZ, AR, CA, CO, CT, DE, DC, FL, GA, HI, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY
Label	Full Name:
TextBox		txtFullName	Modifiers: Public
Label	Address:
TextBox		txtAddress	Modifiers: Public
Label	City:
TextBox		txtCity	Modifiers: Public
Label	ZIP Code:
TextBox		txtZIPCode	Modifiers: Public
Button	OK	btnOK	DialogResult: OK
Button	Close	btnCancel	DialogResult: Cancel
Form			AcceptButton: btnOK CancelButton: btnCancel FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

To add a new form to the application, on the main menu, click Project -> Add Windows Forms
Set the Name to Customers and press Enter
From the Toolbox, add a ListView to the form

While the new list view is still selected, in the Properties window, click the ellipsis button of the Columns field and create the columns as follows:

(Name)	Text	Width
colDrvLicNbr	Driver's Lic. #	100
colFullName	Full Name	100
colAddress	Address	160
colCity	City	100
colState	State	38
colZIPCode	ZIPCode

Design the form as follows:

Control	Text	Name	Other Properties
ListView		lvwCustomers	View: Details GridLines: True FullRowSelect: True
Button	New Customer...	btnNewCustomer	Anchor: Bottom, Right
Button	Close	btnClose	Anchor: Bottom, Right

Double-click an unoccupied area of the form

Change the file 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;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace BethesdaCarRental1
{
    public partial class Customers : Form
    {
        Dictionary<string, Customer> ListOfCustomers;

        public Customers()
        {
            InitializeComponent();
        }

        internal void ShowCustomers()
        {
            if (ListOfCustomers.Count == 0)
                return;

            lvwCustomers.Items.Clear();
            int i = 1;

            foreach (KeyValuePair<string, Customer> kvp in ListOfCustomers)
            {
                ListViewItem lviCustomer = new ListViewItem(kvp.Key);

                Customer cust = kvp.Value;

                lviCustomer.SubItems.Add(cust.FullName);
                lviCustomer.SubItems.Add(cust.Address);
                lviCustomer.SubItems.Add(cust.City);
                lviCustomer.SubItems.Add(cust.State);
                lviCustomer.SubItems.Add(cust.ZIPCode);

                if (i % 2 == 0)
                {
                    lviCustomer.BackColor = Color.Navy;
                    lviCustomer.ForeColor = Color.White;
                }
                else
                {
                    lviCustomer.BackColor = Color.Blue;
                    lviCustomer.ForeColor = Color.White;
                }

                lvwCustomers.Items.Add(lviCustomer);

                i++;
            }
        }

        private void Customers_Load(object sender, EventArgs e)
        {
            ListOfCustomers = new Dictionary<string, Customer>();
            BinaryFormatter bfmCustomers = new BinaryFormatter();

            string strFilename = @"\\EXPRESSION\Bethesda Car Rental\Customers.crc";

            if (File.Exists(strFilename))
            {
                FileStream stmCustomers = new FileStream(strFilename,
                                                         FileMode.Open,
                                                         FileAccess.Read,
                                                         FileShare.Read);

                try
                {
                    // Retrieve the list of employees from file
                    ListOfCustomers = (Dictionary<string, Customer>)bfmCustomers.Deserialize(stmCustomers);
                }
                finally
                {
                    stmCustomers.Close();
                }
            }

            ShowCustomers();
        }
    }
}

Return to the Customers form and double-click the New Customer button

Implement its event as follows:

private void btnNewCustomer_Click(object sender, EventArgs e)
{
    CustomerEditor editor = new CustomerEditor();

    if (editor.ShowDialog() == DialogResult.OK)
    {
        if (editor.txtDrvLicNbr.Text == "")
        {
            MessageBox.Show("You must provide the driver's " +
                            "license number of the customer",
                            "Bethesda Car Rental",
                            MessageBoxButtons.OK, MessageBoxIcon.Information);
            return;
        }

        if (editor.txtFullName.Text == "")
        {
            MessageBox.Show("You must provide the employee's full name",
                            "Bethesda Car Rental",
                            MessageBoxButtons.OK, MessageBoxIcon.Information);
            return;
        }

        string strFilename = @"\\EXPRESSION\Bethesda Car Rental\Customers.crc";

        Customer cust = new Customer();

        cust.FullName = editor.txtFullName.Text;
        cust.Address = editor.txtAddress.Text;
        cust.City = editor.txtCity.Text;
        cust.State = editor.cbxStates.Text;
        cust.ZIPCode = editor.txtZIPCode.Text;
        ListOfCustomers.Add(editor.txtDrvLicNbr.Text, cust);

        FileStream bcrStream = new FileStream(strFilename,
                                              FileMode.Create,
                                              FileAccess.Write,
                                              FileShare.Write);
        BinaryFormatter bcrBinary = new BinaryFormatter();
        bcrBinary.Serialize(bcrStream, ListOfCustomers);
        bcrStream.Close();

        ShowCustomers();
    }
}

Display the Central form

Double-click the Customers button and implement its event as follows:

private void btnCustomers_Click(object sender, EventArgs e)
{
    Customers dlgCustomers = new Customers();
    dlgCustomers.ShowDialog();
}

To save the project, on the Standard toolbar, click the Save All button