Web Services Using Visual .NET

1
Web Services Using Visual .NET

• By
• Kevin Tse

2
Agenda

• What are Web Services and Why are they Useful ?
• SOAP vs CORBA
• Goals of the Web Service Project
• Proposed System Design
• Wireless Application Protocol (WAP)
• Future Projects

3
What are Web Services and Why are they Useful ?

• Web Services are applications that run on the
  internet/intranet and may provide functions and
  methods to users.
• Access to Web Services is via XML (eXtensible
  Markup Language).
• Web Services were developed to cater businesses
  for application interoperability.
• Application Interoperability - (access existing
  data and functionality from different
  applications that may run on different
  platforms). Thus, you have two applications that
  can talk over the internet.

4
What are Web Services and Why are they Useful ?
Cont.

• System that lack processing power necessary for
  specific computations can use Web Services to
  call another computer to perform the function.
• Requests and response from Web Services are
  transmitted via SOAP (Simple Object Access
  Protocol).
• Businesses can conduct transaction via Web
  Services instead of proprietary software.
• Web Services are simpler for businesses because
  SOAP and Web Services are platform independent.

5
SOAP vs CORBA

• CORBA - Common Object Request Broker Architecture
  is Platform and Language Independent.
• CORBA is an open standard for distributed
  computing defined by the OMG (Object Management
  Group). The interaction between the client and
  server in CORBA is mediated by ORBs (Object
  Request Brokers).
• If CORBA requests are routed through a firewall,
  the firewall needs to be reconfigured and
  explicit routing information is added to the IOR
  (Interoperable Object Reference).

6
SOAP vs CORBA cont.

• Web Services does not require the reconfiguration
  of firewalls.
• Web Services uses SOAP and SOAP messages can
  piggyback on HTTP messages through firewalls.
• In mobile applications, if CORBA is used they
  must have ORB components.
• CORBA requires more hardware (on mobile
  platforms) than Web Services thus, increase in
  cost.

7
Goals of the Web Service Project

• To develop a system to serve
• In-house Users
• Internet Users
• Mobile Device Users
• The system will have a high interoperability
  thus most systems can use the Web Service.
• Explore the securities in Visual .NET especially
  in the Web Services aspect.

8
Proposed Designed System

• The proposed system would be a video store that
  contains a database (inventory client details).
• The system will have a local server client
  software written in Visual Basic .NET to query
  and update the database.
• Mobile Client software will be written in either
  C or Visual Basic .NET or ASP.NET or a
  combination of them.

9
Proposed Designed System

• The mobile client application will be able to
  obtain information from the database (the
  updating part is unknown due to security).
• Web Service security will be analyzed and perhaps
  implemented into the final design.

10
Proposed Designed System
Video Server
.NET Framework
XML
XML
To Other Servers
To Other Servers
Web Service
XML
XML
XML
XML
Cell Phone
Pocket PC
Palm
Desktop / Laptop Computers
11
Wireless Application Protocol (WAP)
WAP Gateway
Server
HTML
XML
WML
Cell Phone
12
Wireless Application Protocol cont.

• WAP is an application communication protocol used
  in mobile devices.
• WAP is used by micro-browsers on handheld devices
  and uses WML (Wireless Markup Language).
• The Micro-browser makes minimal demands on the
  hardware, CPU, memory etc.
• WML is based from XML and it create Decks on
  the mini-browser.
• Decks Pages in the WML displayed in the browser.

13
Microsoft Mobile Explorer (MME)
14
Future Projects

• Better security procedures.
• Make a version using CORBA and JAVA and compare
  the overhead, speed and designs.
• Streaming video applications to the mobile
  devices.
• Real Time applications on mobile devices (may or
  may not be possible) connecting to servers.

15
Questions

• ?