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This article mainly explains "ADO.NET data access technology example analysis", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "ADO.NET data access technology example analysis" it!

First of all, the database is established in SqlServer2005Express as the data source, and the realization of this process can be accomplished through data definition statements or directly using the visual interface. We will display the data through the dataGridView control, and the detailed code is as follows:

Public partial class Form3: Form {private SqlConnection myCon; private SqlDataAdapter myAda; private SqlCommand myCmd; private SqlCommandBuilder myCbd; private DataSet mySet; public Form3 () {

Take a look at these sentences, what is this? several variables of reference types are declared. What do you want them to refer to? The name of the variable type is clear at a glance, like myCon is a SqlConnection type, so it must be used to refer to a connection type, but they haven't really referenced anything yet.

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