Introduction to the .NET Framework

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Introduction to the .NET Framework

• MIST4630

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Server-side vs. Client-side Web Development
Technologies

• Client-side Script programs using
• Java applet
• Jscript (A Microsoft product, see next page)
• ActiveX controls (controls can be written in C,
  C, Java, VB)
• Scripts are downloaded and executed at the client
  machine, e.g. from the browser

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Comparing Client-side and Server-side

• Downloading scripts can slow down the application
• Source code is exposed
• Browser may not support the script language used

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Server-side web Development Technologies

• CGI (Common Gateway Interface)
• PHP (Personal Home Pages)
• ASP (Active Server Pages)
• JSP (Java Server Pages)
• ASP.NET

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Server Side Processing
Server running Web software
1. Browser sends URL
2. Server sends Web page
3. Browser sends data
4. Server returns results
PC client running browser
Query and results
Database server
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Sending Data to Server

• Similar to VB windows applications, VB.NET uses
  web forms and many good old control objects to
  generate web pages.
• The input objects (textboxes, radio buttons,
  dropdown list, etc.) are used to send data to the
  web server
• The names of the objects are critical because
  they are links between form pages and server
  processing. The name of an object is an ID used
  to uniquely refer to the object, do not confuse
  the ID with the text property which serves as the
  objects label

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Processing Input Data

• Once the data has been transferred from the
  textboxes or other input objects on the Web page
  to variables on the Web server software,
  processing can begin.
• Processing is handled by the programming language
  (Perl, VBScript, Java, VB .NET, etc.)
• Server creates HTML pages and sends to the
  browser on the client side. Only HTML tags can be
  seen, source code cannot be viewed from the
  browser.

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Comparison of methods
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Introduction to .NETWhat is .NET?

• A vision of how information technology will
  evolve
• A platform that supports the vision
• A business model of software as a service

Borrowed from Dr. Sapossnek
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Introduction to .NETWhat is .NET?

• A vision of how information technology will
  evolve
• Web sites will be joined by Web services
• New smart devices will join the PC
• User interfaces will become more adaptable and
  customizable
• Enabled by Web standards

Borrowed from Dr. Sapossnek
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Introduction to .NETWhat is .NET?

• A platform
• The .NET Framework
• Visual Studio.NET
• .NET Enterprise Servers
• Database, Messaging, Integration, Commerce,
  Proxy, Security, Mobility, Orchestration,
  Content Management
• .NET Building Block Services
• Passport
• .NET My Services (Hailstorm)
• Goal make it incredibly easy to build powerful
  Web applications and Web services

Borrowed from Dr. Sapossnek
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Introduction to .NETWhat is .NET?

• A business model
• Software as a service
• Subscription-based services
• Application hosting, e.g. bCentral

Borrowed from Dr. Sapossnek
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Introduction to .NETthe .NET platform
Protocols HTTP,HTML, XML, SOAP, UDDI
ToolsVisual Studio.NET,Notepad
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The .NET FrameworkWhat Is the .NET Framework?

• A set of technologies for developing and using
  components to create
• Web Forms
• Web Services
• Windows Applications
• Supports the software lifecycle
• Development
• Debugging
• Deployment
• Maintenance

Borrowed from Dr. Sapossnek
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The .NET FrameworkThe .NET Framework and Visual
Studio.NET
VB
C
C
JScript

Common Language Specification
ASP.NET Web Services and Web Forms
WindowsForms
Visual Studio.NET
ADO.NET Data and XML
.NET Framework Base Classes
Common Language Runtime
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The .NET Framework.NET Framework Classes
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Common Language RuntimeServices

• Handling exceptions across languages
• Interoperation between .NET Framework objects and
  COM objects and Win32 DLLs
• Automation of object layout for late binding
• Developer services (profiling, debugging, etc.)

• Code management
• Conversion of MSIL to native code
• Loading and execution of managed code
• Creation and management of metadata
• Verification of type safety
• Insertion and execution of security checks
• Memory management and isolation

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Server Controls

• Server controls take user input to server for
  processing, and return processing result to the
  client, for each client-server round trip.
  Examples include textBox, checkBox, radioButton,
  label, etc.
• The names (ID) of the server controls are
  critical because they are the link between the
  interface and the programming logic.
• Server controls run on the server attribute in
  the server control tag runatserver

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Server Controls

• The form of a server control is
• ltasp control_type idsome name textany
  label onclicksubprogram name runatserver
  /gt
• Where
• Control_type can be
• Label
• Textbox
• Listbox
• Button
• Various others
• Id is the name you assign the control
• Text is the text or caption associated with
  control

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Server Control Properties

• The various server controls have both properties
  and methods and can respond to events
• For example, a Label server control has an id
  property (its name) and a text property (what it
  displays)
• While id properties are assigned when the control
  is created, the text property may be assigned
  then (often used for labels that are descriptors)
  or later during processing (used for textboxes or
  labels that display the output of processing.)
• The Onclick attribute (of a button server
  control) specifies the code (subroutine) that
  will be executed when the button is clicked.