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NET 2.0 introduced a number of new Web controls designed for accessing and modifying data. As such, data can be retrieved or modified and bound to a Web control without writing a single line of code.
These controls allow page developers to declaratively access and modify data without writing any code to perform the data access. We explored the essentials of declarative data binding earlier in this article series in the Data Source Control Basics and Accessing Database Data articles.
It is possible to add a Sql Data Source or Access Data Source control to a web page, specify queries, and then to programmatically execute one of the control's SQL commands.
Such an approach is useful when you need to work with data programmatically, but want to avoid having to write the boilerplate data access code.
The data source control can use parameterized queries for all of its SQL commands ( statement executed with just a single line of code.
The boilerplate data access code - creating a connection object, specifying the connection string, opening the connection, creating a command object, specifying the command text, and so on - is all handled by the data source control when its, methods are called.
In short, using the data source controls in this manner allows for data to be accessed programmatically with a single line of code.
In this article we will examine how to use the Sql Data Source control to programmatically retrieve, insert, and delete data. The Sql Data Source and Access Data Source controls can be used to insert, update, delete, and retrieve data.
The SQL command specified in these properties may contain parameters. We talked about using parameters in detail in the Filtering Database Data with Parameters portion of this article series.
The remainder of this article examines two demos that illustrate working with data programmatically using a Sql Data Source control to retrieve and insert data from the Northwind database.
The complete source code for these demos - as well as a demo that looks at deleting data in much the same manner - is available as a download at the end of this article.
This article is one in a series of articles on ASP. In addition to being used declaratively, the data source Web controls can also be accessed programmatically.
This involved establishing a connection to the database, specifying the SQL command, and then executing the command. NET 2.0's data source controls greatly simplifies this process by encapsulating the data access pattern within a Web control construct.