Chapter Objectives

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(No Transcript)
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Chapter Objectives
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Sending E-Mail from the Web Application

• Security and Privacy Issues Related to E-mail
• HTML-based
• Viruses
• Spam
• Authorized users send e-mail

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The E-Mail Server

• E-mail server - SMTP server
• Simple Mail Transfer Protocol (SMTP)
• Protocol, or set of rules
• Used to transfer mail between servers
• Default folders
• Pickup, Queue, Badmail, Drop, Route, Mailbox,
  SortTemp
• C\InetPub\MailRoot
• Verify the service is running
• Administrative Tools - Open Services
• Runs on port 25

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The E-Mail Server (continued)
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Configuring the E-Mail Server

• Use MMC
• Default SMTP Virtual Server
• General Tab
• Log Files
• C\WINDOWS\Sytem32\Logiles\SmtpSvc1\
• W3C Extended Log File Format
• Advanced button - IP address

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Configuring the E-Mail Server (continued)
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Configuring the E-Mail Server (continued)

• Access Tab
• Authentication button
• Anonymous access
• Basic authentication
• Integrated Windows Authentication
• Similar to IIS

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Configuring the E-Mail Server (continued)
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Configuring the E-Mail Server (continued)

• Messages Tab
• Size of message
• Session size
• Total size of all the message body sections
  within a single connection
• Number of messages per connection
• Number of recipients per connection
• E-mail address for Non-delivery Report
• C\Inetpub\mailroot\Badmail

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Configuring the E-Mail Server (continued)
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Configuring the E-Mail Server (continued)

• Delivery Tab
• How the message is delivered
• If cant be sent - number of minutes to wait
  before resend
• Outbound Security
• Configure users and authentication
• Require encryption (TLS) - more secure then SSL
• Outbound Connections
• Limit number of messages, time-out
• Limit number of connections per domain
• Change port number

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Configuring the E-Mail Server (continued)
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Configuring the E-Mail Server (continued)

• Advanced Figure 12-8
• Configure servers that can send or relay messages
• Prevent invalid domain address in Mail From line
  using Masquerade domain
• Hop count - number of servers permitted to pass
  through
• Smart host - a virtual server which may be more
  direct or less costly than sending it directly to
  a domain

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Configuring the E-Mail Server (continued)
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Configuring the E-Mail Server (continued)

• LDAP Routing Tab
• Lightweight Directory Access Protocol
• Primary protocol for Active Directory
• Directory service that stores information about
  objects on a network
• Security Tab
• Who can change settings - default administrators
  group
• Only trusted users to alter settings
• Domains
• E-mail at tarastore.com and tarastore.net sent to
  same server

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Configuring the E-Mail Server (continued)
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Configuring the E-Mail Server (continued)
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E-Mail Objects

• .NET Mail classes
• CDONTS Objects - communicate with SMTP server
• C\WINDOWS\system32\cdonts.dll
• Places message in the Pickup folder - or by hand
• SMTP places message into Queue folder
• If local recipient - places into Drop folder
• If remote account - sends message to another
  server
• If rejected or returned, places in Badmail folder
  
• Creates Non-Delivery report (NDR)

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E-Mail Objects (continued)
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The .NET Mail Classes

• System.Web.Mail namespace
• MailMessage class - construct an email message
• MailAttatchment class - identify a file
  (attachments)
• SmtpMail class - send the e-mail message

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The MailMessage Class Properties

• MailFormat enumeration - format
• MailFormat.Html, MailFormat.Text
• MailPriority enumeration - importance
• MailMessage.Normal, MailMessage.High,
  MailMessage.Low
• MailAttachment class - construct an e-mail
  attachment
• Filename - attachment location as string - drive,
  path, filename
• MailMessage.Attachments - list of attachments
• MailEncoding enumerator
• MailEncoding.UUEncode default
• MailEncoding.Base64 - binary encoding such as
  graphics

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The MailMessage Class Properties (continued)

• MailMessage.To - recipient multiple recipients
  separated with semi-colon
• MailMessage.From - address of the sender
• MailMessage.Subject - subject line
• MailMessage.Body - body
• MailMessage.Cc - a semicolon-delimited list
• MailMessage.Bcc - semicolon-delimited list
• MailMessage.UrlContentBase - URL base of all
  relative URLs used within the HTML - encoded body
• MailMessage.UrlContentLocation - identify the
  location of content within message

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The MailMessage Class Properties (continued)

• SmtpServer change the SMTP Server from default
  SMTP Virtual Server to another server
• Send method creates the message
• Writes it to the Pickup folder
• Eventually its moved to the Queue folder
• SmtpMail.Send("sender_at_sender.com",
• "recipient_at_recipient.com", "Subject", "Message")

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Sending an E-Mail Message from an ASP.NET Web
Page

• Create Chapter12 project and import files
• Email_SendSingleMessage.aspx
• Import namespaces
• Imports System.Web.Mail
• Create mail object, set properties, send message
• Release variables
• View page in the browser
• View message in Drop folder
• Folder varies with your system

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Sending an E-Mail Message from an ASP.NET Web
Page (continued)

• Dim MM As New MailMessage()
• MM.From "your_email_at_your_address.edu"
• MM.To "your_email_at_your_address.edu"
• MM.Subject "CDONTS Exercise"
• MM.Body "I have completed the CDONTS exercise"
• MM.BodyFormat MailFormat.Text
• MM.Priority MailPriority.Normal
• SmtpMail.SmtpServer "Server name"
• SmtpMail.Send(MM)
• MM Nothing

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Sending an E-Mail Message from an ASP.NET Web
Page (continued)
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Troubleshooting E-Mail Messages

• The SendUsing configuration value is invalid"
• Solution
• Reconfigure the SMTP settings programmatically
  and assign a server name before the message is
  sent.
• "The server rejected one or more recipient
  addresses."
• Unable to relay for your-email_at_your_address.edu
  
• Solution
• Change relay settings - allow your server to
  relay messages
• Only allow messages from your computer to relay
  messages
• Use exception handling and error messages
• Read Non-Delivery report (NDR)

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Troubleshooting E-Mail Messages (continued)
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Troubleshooting E-Mail Messages (continued)
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Troubleshooting E-Mail Messages (continued)
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Storing and Retrieving Data in the Web Servers
File System

• System.IO namespace
• Interact with the file system
• Classes
• File, FileStream, and Directory
• To create, read, and delete files
• Newer classes FileSystemInfo
• Access to DirectoryInfo and FileInfo classes
• View Class Browser Application

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Storing and Retrieving Data in the Web Servers
File System (continued)
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Working with Directories

• DirectoryInfo class
• Access to properties
• Dim DD As DirectoryInfo _
• New DirectoryInfo("C\Inetpub\wwwroot\Chap
  ter12\")
• Label1.Text DD.FullName
• Other properties
• Attributes, CreationTime, Exists
• LastAccessTime, LastWriteTime
• FullName, Extension, Name, Parent, and Root

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Working with Directories (continued)

• Iterate through DirectoryInfo
• Dim MySubDirList As String
• Dim SubDir As DirectoryInfo
• For Each SubDir In DD.GetDirectories()
• MySubDir SubDir.Name "ltbr /gt"
• Label2.Text MySubDirList
• Next

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Working with Directories (continued)

• Iterate through FileInfo
• Dim MyFileList, MyPath As String
• MyPath TextBox1.Text
• Dim MyFile As FileInfo
• For Each MyFile In DFL.GetFiles
• Select Case MyFile.Extension
• Case ".aspx"
• MyFileList _
• "lta href'" MyFile.Name "'gt" _
• MyFile.Name "lt/agtltbr /gt"
• Case ".vb", ".resx"
• Case Else
• MyFileList MyFile.Name "ltbr /gt"
  
• End Select
• Next
• Label3.Text MyFileList

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Working with Directories (continued)

• DisplayChapter12Dir.aspx
• DisplayDirectoryInfo function
• Dim DD As DirectoryInfo _
• New DirectoryInfo(MyPath)
• lbl1.Text DD.FullName
• lbl2.Text DD.Name
• lbl3.Text DD.Attributes
• lbl4.Text DD.CreationTime.ToShortDateString
• lbl5.Text DD.LastAccessTime.ToShortDateString
• lbl6.Text DD.LastWriteTime.ToShortDateString
• lbl7.Text DD.Root.Name
• lbl8.Text DD.Parent.Name
• lbl9.Text DD.Exists
• lbl10.Text GetLength(DirSize(DD))

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Working with Directories (continued)
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Working with Directories (continued)
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Working with Directories (continued)
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Creating and Deleting Directories

• DirectoryInfo - to create and delete directories
• CreateSubdirectory method - create a new
  directory
• Pass the name of the directory
• CreateDir.aspx
• Buttons to create and delete directories
• DisplayDirectory function
• Retrieve the Users subdirectory list
• c\Inetpub\wwwroot\Chapter12\Users

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Creating and Deleting Directories (continued)

• System.Exception
• System.IO
• IOException
• DirectoryNotFoundException - directory does not
  exist
• PathTooLongException - exceeds 248 characters
• FileNotFoundException
• Security.SecurityException - dont have
  permission
• System.ArgumentException
• Create a directory with invalid characters ltgt?
  or \\

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Creating and Deleting Directories (continued)

• Dim DDL As DirectoryInfo _
• New DirectoryInfo(MyPath)
• Dim SubDir As DirectoryInfo
• Dim MyHash As New Hashtable
• For Each SubDir In DDL.GetDirectories()
• MyHash.Add(SubDir.Name, SubDir.Name)
• Next
• DropDownList1.DataTextField "Key"
• DropDownList1.DataValueField "Value"
• DropDownList1.DataSource MyHash
• DropDownList1.DataBind()

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Working with Directories (continued)

• btnCreate_Click procedure
• Dim DD As DirectoryInfo _
• New DirectoryInfo(MyPath)
• DD.CreateSubdirectory(TextBox1.Text)
• btnDelete_Click procedure
• Dim DD2 As DirectoryInfo _
• New DirectoryInfo(MyPath _
• DropDownList1.SelectedItem.ToString)
• Label1.Text "The ltbgt" _
• DropDownList1.SelectedItem.ToString _
• " lt/bgtdirectory was deleted."
• DD2.Delete()

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Working with Directories (continued)
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Creating and Reading Files from an ASP.NET Page

• FileInfo class
• Common Properties
• Attributes, CreationTime, LastAccessedTime,
  LastWriteTime
• Name, FullName, and Exists
• Attributes (Right click on file and select
  Properties)
• Hidden, Archive, ReadOnly, System
• Methods
• CopyTo, MoveTo, Delete
• CreateText method
• Returns StreamWriter object and open file for
  editing
• Create method
• Wrapper for the functionality of File.Create
• Uses FileStream object not StreamWriter object

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Creating a Text File

• CreateFile.aspx
• btnCreate_Click - creates the FileInfo object
• Create StreamWriter object to create the file and
  open it for writing
• Dim MyFile As String MyPath TextBox1.Text
• Dim MyFileInfo As FileInfo New FileInfo(MyFile)
• Dim SW As StreamWriter File.CreateText(MyFile)

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Creating a Text File (continued)

• Write the contents to the file - Write and
  WriteLine
• SW.Write("This file was ")
• SW.WriteLine("created by ")
• SW.Write("Your Name")
• SW.Write(vbCrLf)
• SW.WriteLine("on " Now.Date.ToShortDateString)
• SW.WriteLine()
• SW.WriteLine()
• SW.Write(TextBox1.Text)
• SW.Close()
• MyFileInfo Nothing

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Creating a Text File (continued)

• btnDelete_Click event procedure
• Label1.Text "The ltbgt" TextBox1.Text _
• " lt/bgtfile was created successfully."
• Dim MyFileInfo As FileInfo New FileInfo(MyFile)
• Label1.Text "The ltbgt" _
• DropDownList1.SelectedItem.ToString _
• " lt/bgtfile was deleted."
• MyFileInfo.Delete()
• MyFileInfo Nothing

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Creating a Text File (continued)

• btnDisplay_Click
• Retrieves file - FileInfo object and opens file
  with OpenText
• Returns StreamReader object
• ReadToEnd - reads entire file line by line until
  end of file
• Dim MyFileInfo As FileInfo New FileInfo(MyFile)
• Dim SR As StreamReader MyFileInfo.OpenText()
• Label3.Text SR.ReadToEnd
• SR.Close()
• SR Nothing

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Creating a Text File (continued)
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Creating an HTML Page

• CreateHTMLFile.aspx
• Page_Load event hander - display default message
• If Not Page.IsPostBack Then
• HyperLink1.Text ""
• Label3.Text _
• "Enter the name of the HTML file to create."
• End If

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Creating an HTML Page (continued)

• btnCreate_Click
• Creates FileInfo, StreamWriter create file and
  open it
• Dim MyFile As String MyPath TextBox1.Text
• Dim MyFileInfo As FileInfo New FileInfo(MyFile)
• HyperLink1.Text ""
• Label1.Text "ltbgtThe file was created!lt/bgt"
• Dim SW As StreamWriter File.CreateText(MyFile)

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Creating an HTML Page (continued)

• Insert content
• SW.WriteLine("lthtmlgtltheadgt")
• SW.WriteLine("lttitlegtCreating an HTML File ")
• SW.WriteLine(TextBox1.Text)
• SW.WriteLine("lt/titlegtlt/headgt")
• SW.WriteLine("ltbodygt")
• SW.WriteLine(TextBox2.Text)
• SW.WriteLine("lthr /gtltbr /gtltbr /gtCreated on ")
• SW.WriteLine(Now.Date.ToShortDateString)
• SW.WriteLine("lt/bodygtlt/htmlgt")
• SW.Close()

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Creating an HTML Page (continued)

• Set hyperlink properties
• Reset label
• MyFileInfo Nothing
• HyperLink1.Text "Click here to read the HTML
  file!"
• HyperLink1.NavigateUrl _
• "http//localhost/Chapter12/Users/"
  TextBox1.Text
• Label1.Text ""

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Creating an HTML Page (continued)

• btnDelete_Click event procedure delete file
• Dim MyFile As String MyPath TextBox1.Text
• Dim MyFileInfo As FileInfo New FileInfo(MyFile)
• HyperLink1.Text ""
• Label1.Text "ltbgtThe File was deleted!lt/bgt"
• MyFileInfo.Delete()
• MyFileInfo Nothing

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Creating an HTML Page (continued)
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Working with Alternative Platforms PDAs and
Mobile Devices

• Web application for mobile devices
• Wide range of hardware and software
• Screen size, resolution, color, graphics,
  multimedia capabilities
• Support scaled-down version of a browser, text
• Main platforms Palm, Windows Pocket PC, Windows
  CE
• Simulators for devices are available to
  developers
• .NET Compact Framework runs portable and mobile
  devices
• Develop client as stand-alone application

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Creating a WML Document

• Wireless Application Protocol (WAP)
• Standard to program mobile device
• Wireless S Protocol (WSP)
• Within the WAP - a transport protocol that
  performs the same functions as HTTP for mobile
  devices
• WAP standards Wireless Markup Language (WML)
• To work with Web content
• File extension .wml
• Compaq and other devices are tested by Microsoft

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Creating a WML Document (continued)
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Creating a WML Document (continued)
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Creating a WML Document (continued)
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Building PDA and Mobile Applications in Visual
Studio .NET

• System.Web.Mobile namespace (assembly)
• Mobile Web Forms Controls
• Mobile controls
• System.Web.UI.MobileControls
• Label control
• System.Web.UI.MobileControls.Label
• Mobile Internet Designer drag and drop controls
• Mobile QuickStart
• http//localhost/mobilequickstart/

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Using Mobile Controls in an ASP.NET Application

• Mobile Forms
• Display on mobile devices supports
• WML, compact HTML (cHTML), HTML 3.2
• Mobile Web Page
• System.Web.UI.MobileControls.MobilePage
• Each Web page contains a register directive for
  registering the mobile tag controls with the
  mobile control namespace

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Using Mobile Controls in an ASP.NET Application
(continued)

• lt_at_ Page Language"vb" AutoEventWireup"false"
  Codebehind"MobileWebForm1.aspx.vb"
  Inherits"Chapter12Mobile.MobileWebForm1" gt
• lt_at_ Register TagPrefix"mobile"
  Namespace"System.Web.UI.MobileControls"
  Assembly"System.Web.Mobile" gt

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Creating a Mobile Form

• MFDisplayList.aspx
• Insert Label control
• ID - lblStoreName, Font Trebuchet MS,
• ForeColor - 004040, Alignment Center,
• Bold - True, Text Tara Store Home Page
• Add List control
• Decoration - none, Font Trebuchet MS,
• ForeColor - 004040

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Creating a Mobile Form (continued)

• Create array (ArrayList) AR1 in Page_Load event
  procedure
• Dim AR1 As New ArrayList(4)
• AR1.Add("Irish History")
• AR1.Add("Irish Music")
• AR1.Add("Travel in Ireland")
• AR1.Add("Sports in Ireland")
• List1.DataSource AR1
• List1.DataBind()

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Creating a Mobile Form (continued)
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Creating a Mobile Form (continued)

• Properties
• Wrapping NoWarp to stop from wrapping
• TextView change to scroll horizontally for
  large text
• Paginate true - divide list into multiple pages
  use PagerStyle
• PageLabel identifies number of pages available
• NextPageText and PreviousPageText, PagerStyle
  elements
• assign a text value to display in the window
• PagerStyle PageLabel"Page 0 of 1"
• PagerStyle NextPageText"Continue"
• PagerStyle PreviousPageText"Back"

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Creating a Mobile Form (continued)

• Each card represented by a separate Mobile Form
• Create a link control to other cards or another
  WML file
• NavigateURL is used to identify links
• pound sign is used to indicate internal link
• Can insert scripts
• Form Templates
• reusable content like HeaderTemplate and
  FooterTemplate
• Mobile Form controls - other controls
• Paragraph, line break, Bold, Italic, Anchor

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Creating Multiple Web Forms

• MFHomePage.aspx
• Insert Label control - format
• Add List control - format
• Add Form tag to the page
• Add ObjectList control to Products Form - format
• Add Form tag to the page
• Add Image control to Products Form - format
• Add Form tag to the page
• Add PhoneCall control to Products Form - format
• View HTML
• Page_Load procedure - create hash tables and
  array lists and bind to controls

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Creating Multiple Web Forms (continued)
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Creating Multiple Web Forms (continued)
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Summary

• SMTP server is the default mail service
• Access SMTP properties via System.Web.Mail
  namespace
• MailMessage class provides sender and recipient
  data and message content
• System.IO provides classes that interact with the
  file system
• DirectoryInfo accesses directories and
  subdirectories
• FileInfo accesses the file and create basic files
• CreateText method returns StreamWriter object and
  open file for editing
• Create method uses FileStream object and is a
  wrapper for the functionality of File.Create

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Summary (continued)

• Write method is used to write content to a file
• WAP is standard to create programs on a mobile
  device
• WML is XML compliant language to create mobile
  applications
• ASP.NET Mobile Server controls contain Mobile
  Forms, a Web page that contains Mobile controls
• Mobile controls inherit System.Web.UI.MobileContro
  ls.MobilePage