A DataAdapter is used to access data from a data source by functioning as a bridge between DataSet and a data source. DataAdapter class includes an SQL command set and a database connection. It is helpful to fill the DataSet and resolve changes to the data source.
The DataAdapter will make use of the Connection object that belongs to the .NET Framework data provider for connecting with a data source. Along with that, it will also use Command objects to retrieve data from the data source as well as to resolve changes to the data source.
DataAdapter properties that permit the user to control the database are the Select command, Update command, Insert command, and Delete command.
Example code for the usage of DataAdapter :
using System;
using System.Data.SqlClient;
using System.Data;
namespace DataAdapterExample
{
public partial class DataAdapterDemo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
using (SqlConnection conn = new SqlConnection("data source=.; database=items; integrated security=SSPI"))
{
SqlDataAdapter da = new SqlDataAdapter("Select * from items", conn);
DataSet s = new DataSet();
da.Fill(s);
GridView1.DataSource = s;
GridView1.DataBind();
}
}
}
} ​
Here, DataAdapter will receive the data from the items table and fill the DataSet, which will be later used to display the information retrieved from the items database.
