Day 19. ADO.NET and XML Web Services

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As you learned on Day 1, "ADO.NET in Perspective," one of the design goals of ADO.NET was to efficiently support the multi- tier programming model that has been widely adopted in the industry in the last several years . To that end, you've learned how you can use the DataSet object to cache data returned from a data store, and then pass it between tiers of a distributed application by taking advantage of the serialization done behind the scenes by the common language runtime. Although this works great when the tiers are located on a single machine or a set of machines within a single data center, it also supports intranet and Internet scenarios in which the tiers are distributed across an organization or exist in entirely different organizations. In these cases, the glue that binds the tiers is XML Web Services. As you'll learn today, ADO.NET ”because of its support for XML ”integrates nicely with an XML Web Services model.

Specifically, today you'll learn

• How DataSet objects can be exposed through an XML Web Service

• How DataSet objects are consumed by an XML Web Service client

• How to update data through an XML Web Service using ADO.NET

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