Best Practices for Building Web Services with Visual Studio ®.NET Sanguan Thammarojsakul Microsoft MVP -.NET Department of Computer Science, Faculty of Science and Technology Assumption University of Thailand

What we will cover  ASP.NET Web Services  ACT  SOAP Security  Global XML Web Services Architecture (GXA)  scalability, interoperability, reliability, and security

Session Prerequisites  Familiarity with.NET Programming  Know Visual Basic ®.NET  Familiar with ASP.NET Level 300

Agenda  Architecture of Web Services  Testing Web Services  Securing SOAP  Web Services in the Enterprise

Architecture of Web Services Open Middle Tier Implementation  What is a Web Service?  A website without the user interface  A method for defining interfaces above the transport protocol  XML Interoperability  Web Services support 4 protocols  Http Get - Interoperable  Http Post - Interoperable  Http SOAP - Interoperable  Import as a DLL for an object interface -.NET

Architecture of Web Services Implementing XML Services   Declares the interface, indicates that the class defined is a web service  Inherits System.Web.Services.WebService  Parent class for all web services in.NET   Each method which is exposed as part of the service.  Return values can be supported in any request format but Output parameters are only supported in SOAP

Architecture of Web Services Service Discovery  UDDI: Universal Description, Discovery and Integration  Design time specification for the discovery of services and communication of their interface  Does not define the service implementation and protocol details.  Complemented by WSDL  Managed by an industry-wide consortium; for details visit

Agenda  Architecture of Web Services  Testing Web Services  Securing SOAP  Web Services in the Enterprise

Testing Web Services Default ASMX Pages  Visual Studio creates a default test frame for each web service  Accessible from the.asmx page  The automated page only supports and test the http Get protocol  Can act as the starting point for both functional and performance testing

Testing Web Services Performance Testing  Application Center Test  Allows for the automated execution of web based resources using VB Scripts  Two versions  Full version in Application Center Server  Developer Version in Visual Studio.NET Enterprise Architect edition  Produces XML based results  Supports Side by Side Comparison  Integrated with Performance Counters for collection of Transaction Cost Analysis data

Testing Web Services Transaction Cost Analysis Transaction Cost Analysis Equation Cycles = N * S * avg (Pt) / avg(Rps) Where:  N = Number of Processors  S = Speed of Processors  Pt = System: % Total Processor Time  Rps = ACT ASP Requests per second  Cycles = Average CPU cycles

Demonstration 1 Transaction Calculator Service Run the T_Calc Service Create a Simple ACT Test Run a Custom ACT Test

Agenda  Architecture of Web Services  Testing Web Services  Securing SOAP  Web Services in the Enterprise

Securing SOAP Authentication & SSL  Authentication is supported  Selected from Internet Services Manager  NTLM and Basic authentication are available  Use: New Net.NetworkCredential()  Authentication does not protect data  To protect data can use SSL  From Browser preface call with  From Code modify.url property to include  Https is transport specific

Securing SOAP Encoding & Encryption  UTF-8 Encoding  Can be used for the contents of a SOAP Message  Allows for the inclusion of binary data  Encryption .NET supports several forms of encryption  Can be used to protect data without relying on transport protocol  Requires key synchronization

Demonstration 2 Authentication/Security Create a service requiring Authentication Create a Windows Form Client Call a Service that Encodes response Data

Agenda  Architecture of Web Services  Testing Web Services  Securing SOAP  Web Services in the Enterprise

Web Services in the Enterprise Messaging Infrastructure  Global XML Services Architecture (GXA)  GXA has four key specifications to date  WS-Security  Credential exchange, message integrity, and message confidentiality  WS-License  Encoding for common license formats

Web Services in the Enterprise Messaging Infrastructure  WS-Referral  Partition URL namespaces between nodes  WS-Routing  Route messages across intermediate SOAP nodes  GXA is still under development as an industry wide standard.  Other specifications may be added as the standard develops.

Web Services in the Enterprise SOAP Extensions  SOAP Extensions  Added to the SOAP envelope  Provide a generic means of implementing additional capabilities. .NET SoapExtension  System.Web.Services.Protocols.SoapExtension  Will be the core of implementing GXA

Session Summary  Use Web Services as Middleware  Use ACT for lifecycle testing support  Use.NET’s built in mechanisms for securing web services  SOAP Extensions

For More Information…  MSDN Web site at   WebServices Specifications  /library/en-us/dnsrvspec/html/wsspecsover.asp  Reliable XML Web Services  /library/en-us/dnexxml/html/xml asp  Using SOAP Extensions for Encryption  /library/en-us/dnaspnet/html/asp asp

For More Information…  Transaction Cost Analysis  r/techinfo/planning/2000/wp_tca.asp  Global XML Web Services Architecture  rvices/gxa_overview.aspx  GotDotNet.com

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Training Training Resources for Developers  Developing XML Web Services Using Visual C#  Course #2524  Building ASP.NET Applications  Course #2063  Programming with Microsoft ® Visual Basic.NET  Course #2373 To locate a training provider for this course, please access mcspreferral.microsoft.com/default.asp Microsoft Certified Technical Education Centers (CTECs) are Microsoft’s premier partners for training services

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Session Credits  Author: Bill Sheldon  Producer/Editor: Field Content Team  Reviewers  Field Content Council