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This article mainly shows you how to use ADO. NET components. The content is simple and easy to understand. The organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn how to use ADO. NET components.

DataSet component in ADO. NET

Another important component of ADO. NET components, it is also the essential difference between ADO. NET and all previous database access technologies. DataSet allows data retrieved from a database to be stored in memory. Because of this feature, it solves two important problems: first, the programming model is independent of the data source, and second, ADO. NET can support offline access.

DataTable dt = dataSet1.Tables[0]; //DataColumn dc = dt.Columns[0]; //DataRow dr = dt.Rows[0] in *** column of table; //row *** in table

DataSet has been used in previous sections, but not discussed in depth. A DataSet is structured like a relational database in that it consists of objects with tables DataTable and relationships between tables DataRelation. DataTable contains DataColumn (a column of the table) and DataRow (a row of the table), as follows.

An overview of Visual Studio 2008 programs

Visual Studio 2005 Professional

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Comments Visual Studio 2008 Tools Using

DataRelations contain ChildRelations and ParentRelations. ADO. NET components have multiple forms of access, as shown below. Because its structure is similar to that of a relational database and supports table operations, it can be accessed just like a relational database, including adding, deleting, and retrieving tables and adding, deleting, modifying, and updating data in tables. Access is done using the collection method. DataSets are accessed in the same way as XML formats, which will be explained later in XML.

Figure 14-26 Classification of DataSet The above is "How to use ADO. NET components" All the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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