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We can now use ASP.NET to create Web Services based on industrial standards including XML, SOAP, and WSDL.
A Web Service is a?software program that uses XML to exchange information with other software via common internet protocols. In a simple sense, Web Services are a way of interacting with objects over the Internet.
- Language-Independent.
- Protocol Independent.
- Platform Independent.
- It assumes a stateless service architecture.
- Scalable (e.g. multiplying two numbers together to an entire customer-relationship management system).
- Programmable (encapsulates a task).
- Based on XML (open, text-based standard).
- Self-describing (metadata for access and use).
- Discoverable (search and locate in registries)- the ability of applications and developers to search for and locate desired Web services through registries. This is based on UDDI.
- Microsoft coined the term "Web services" in June 2000, when the company introduced Web services as a key component of its .Net initiative, a broad new vision for embracing the Internet in the development, engineering, and use of software.
- As others began to investigate Web services, it became clear that the technology could revolutionize (be the next stage in) distributed computing.
- Web services en com a set of related standards that can enable any two computers to communicate and exchange data via a network, such as the Internet.
- The primary standard used in Web services is the Extensible Markup Language (XML) developed by the World Wide Web Consortium (W3C).
- Developers use XML tags to describe individual pieces of data, forming XML documents, which are text-based and can be processed on any platform.
- XML provides the foundation for many core Web services standards (SOAP, WSDL, and UDDI) and vocabularies (XML-based markup for a specific industry or purpose).
- Almost every type of business can benefit from Web services such as expediting software development, integrating applications and databases, and automating transactions with suppliers, partners, and clients.
- XML- Describes only data. So, any application that understands XML regardless of the application's programming language or platform has the ability to format XML in a variety of ways (well-formed or valid).
- SOAP- Provides a communication mechanism between services and applications.
- WSDL- Offers a uniform method of describing web services to other programs.
- UDDI- enables the creation of searchable Web services registries.
When these technologies are deployed together, they allow developers to package applications as services and publish those services on a network.
- Use open, text-based standards, which enable components written in?various languages and for different platforms to communicate.
- Promote a modular approach to programming, so multiple organizations can communicate with the same Web service.
- Comparatively easy and inexpensive to implement, because they employ an existing infrastructure and because most applications can be repackaged as Web services.
- Significantly reduce the costs of enterprise application (EAI) integration and B2B communications.
- Implemented incrementally, rather than all at once which lessens the cost and reduces the organizational disruption from an abrupt switch in technologies.
- The Web Services Interoperability Organization (WS-I) consisting of over 100 vendors promotes interoperability.
- SOAP, WSDL, and UDDI- require further development.
- Interoperability.
- Royalty fees.
- Too slow for use in high-performance situations.
- Increase traffic on networks.
- The lack of security standards for Web services.
- The standard procedure for describing the quality (i.e. levels of performance, reliability, security, etc.) of particular Web services – management of Web services.
- The standards that drive Web services are still in draft form (always will be in refinement).
- Some vendors want to retain their intellectual property rights to certain Web services standards.
A web service can perform almost any kind of task.
- Web Portal-?A web portal might obtain top news headlines from an Associated Press web service.
- Weather Reporting- You can use the Weather Reporting web service to display weather information on your personal website.
- Stock Quote- You can display the latest update of the Share market with Stock Quote on your website.
- News Headline: You can display the latest news update by using News Headline Web Service on your website.
- You can make your own web service and let others use it. For example, you can make Free SMS Sending Service with a footer with your company's advertisement, so whosoever uses this service indirectly advertises your company. You can apply your ideas in N no. of ways to take advantage of it.
Example of Creating Web Service in .Net
