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Phone Book in C#

, 9 Sep 2009
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Phone book in C#
phonebook.png

Introduction

Some days ago, I lost my cellphone. All of my contact numbers were in the cellphone and I lost them. Miraculously I found my cellphone, but I decided to create a phone book application to store my contacts. This application was written in C# and LINQ. I used an XML file to store contacts and I encoded them with the 3DES algorithm to protect them.

Application Features

Live Search

You could search your contacts as Live.

Multi Users

The application can have several users. Each user can just see his/her contacts.

Password Reminder

passwordReminder.png

If you want to use this feature, you have to enter a valid User name and Password of your SmptClient in C# code.
Also, you can enter your Gmail's user name and password. You have to enter them in Forgets the password region in UserForm.cs.

try
{
    NetworkCredential loginInfo = new NetworkCredential("username", "password");
    MailMessage msg = new MailMessage();
    msg.From = new MailAddress("sth@gmail.com");
    msg.To.Add(new MailAddress(user.First().Attribute("Email").Value));
    msg.Subject = "Phonebook Password";
    msg.Body = "Yours Password = " + password;
    msg.IsBodyHtml = true;
    SmtpClient client = new SmtpClient("smtp.gmail.com");
    client.EnableSsl = true;
    client.UseDefaultCredentials = false;
    client.Credentials = loginInfo;
    client.Send(msg);

    MessageBox.Show("Your password has been sent to your email", "Email sent",
    	MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

At last, compile the project with new data and use it.

Security

To protect contacts, I've used .NET 3DES classes.

//Base on : http://msdn.microsoft.com/en-us/library/system.security.cryptography.
	//tripledescryptoserviceprovider.aspx
public static void EncryptToFile(String Data, String FileName, byte[] Key, byte[] IV)
{
    try
    {
        // Create or open the specified file.
        FileStream fStream = File.Open(FileName, FileMode.Create);

        // Create a CryptoStream using the FileStream
        // and the passed key and initialization vector (IV).
        CryptoStream cStream = new CryptoStream
				(fStream, new TripleDESCryptoServiceProvider().
        	CreateEncryptor(Key, IV), CryptoStreamMode.Write);

        // Create a StreamWriter using the CryptoStream.
        StreamWriter sWriter = new StreamWriter(cStream);

        // Write the data to the stream
        // to encrypt it.
        sWriter.WriteLine(Data);

        // Close the streams and
        // close the file.
        sWriter.Close();
        cStream.Close();
        fStream.Close();
    }
    catch (CryptographicException e)
    {
        Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
    }
    catch (UnauthorizedAccessException e)
    {
        Console.WriteLine("A file access error occurred: {0}", e.Message);
    }
}

public static string DecryptFromFile(String FileName, byte[] Key, byte[] IV)
{
    try
    {
        // Create or open the specified file.
        FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate);

        // Create a CryptoStream using the FileStream
        // and the passed key and initialization vector (IV).
        CryptoStream cStream = new CryptoStream
				(fStream, new TripleDESCryptoServiceProvider().
        	CreateDecryptor(Key, IV), CryptoStreamMode.Read);

        // Create a StreamReader using the CryptoStream.
        StreamReader sReader = new StreamReader(cStream);

        // Read the data from the stream
        // to decrypt it.
        string val = sReader.ReadToEnd();

        // Close the streams and
        // close the file.
        sReader.Close();
        cStream.Close();
        fStream.Close();

        // Return the string.
        return val;
    }
    catch (CryptographicException e)
    {
        Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
        return null;
    }
    catch (UnauthorizedAccessException e)
    {
        Console.WriteLine("A file access error occurred: {0}", e.Message);
        return null;
    }
}

No one can see your data in the XML file, because it is encoded. I suggest to change the Key and the Vector and use your own ones in TripleDES.cs. These are default Key and Vector:

public static byte[] ByteKey = 
	new byte[] { 65, 20, 35, 105, 249, 97, 242, 87, 163, 127, 124, 121,
	73, 225, 209, 103, 5, 198, 68, 221, 122, 14, 224, 2 };
public static byte[] IV = new byte[] { 160, 175, 98, 111, 208, 167, 177, 23 };

If you are a beginner in 3DES, you can use this application to change your Key and IV.

3DESKeyGenerator.png

Settings

There are some cool settings to use the application better.

settings.png

You can change the Direction of contacts or type of Calendar to show item's register date. You can also change the Application's font size.

History

  • 18th July, 2009: First post
  • 21st July, 2009: Updated
  • 9th September, 2009: Updated

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Mohammad Dayyan

Iran (Islamic Republic Of) Iran (Islamic Republic Of)
No Biography provided

Comments and Discussions

 
Questionupdate is not updating the data Pinmembernrdsp1-May-12 5:12 
Questionتشکر Pinmemberamir 212-Jul-11 21:53 
Generalmy vote 5 Pinmemberwaqas31611-Nov-10 19:07 
Generalthnax Dr.Mohammad Dayyan PinmemberAhmad9812-Oct-10 10:57 
GeneralGood work :) Pinmembersunless_201-Jul-10 11:28 
GeneralDatabase! Pinmemberdj_amin11-Mar-10 23:56 
Ranteyvaal Pinmemberakbar_pd10-Jan-10 23:46 
GeneralMy vote of 1 PinmemberStojaneee3-Jan-10 13:43 
GeneralRe: My vote of 1 PinmemberFernandoUY24-Jan-12 19:48 
General[My vote of 2] just ok PinmemberDonsw6-Oct-09 15:50 
QuestionWhy Des? PinmemberCuchuk Sergey9-Sep-09 22:27 
AnswerRe: Why Des? PinmemberMohammad Dayyan9-Sep-09 23:09 
GeneralPrinting report PinmemberBlubbo28-Jul-09 1:42 
GeneralRe: Printing report PinmemberMohammad Dayyan8-Sep-09 10:56 
Generalexport and import contact PinmemberNiN9E28-Jul-09 1:36 
GeneralMy vote of 1 PinmemberGwannoes27-Jul-09 20:25 
GeneralRe: My vote of 1 PinmemberFernandoUY24-Jan-12 19:47 
GeneralRe: My vote of 1 PinmemberGwannoes6-Feb-12 22:42 
GeneralRe: My vote of 1 PinmemberFernandoUY10-Feb-12 8:16 
GeneralMy vote of 1 PinmemberJoe Sonderegger27-Jul-09 20:02 
GeneralMy vote of 1 Pinmembermheidari22-Jul-09 20:50 
GeneralRe: My vote of 1 PinmemberMohammad Dayyan23-Jul-09 4:50 
General[My vote of 1] This is a junior high school exercise PinmemberITMaiO22-Jul-09 0:35 
GeneralRe: [My vote of 1] This is a junior high school exercise PinmemberMohammad Dayyan23-Jul-09 4:48 
GeneralRe: [My vote of 1] This is a junior high school exercise PinmemberMario Majcica23-Jul-09 5:07 

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