Can you explain what the ADO.NET technology is and what it is used for in application development?

ADO.NET is a set of classes in the .NET Framework designed for interacting with databases and other data sources.

Main features of ADO.NET:

• Establishing a connection to a database (using SqlConnection, OleDbConnection, etc.)
• Executing commands and queries (SqlCommand)
• Reading data with DataReader (streaming read)
• Working with data in memory via DataSet and DataTable (disconnected mode)
• Transaction management

ADO.NET is used to create applications that can read, modify, and save data in various DBMSs, providing efficient and controlled data access.

Example of a simple database query:

using (var connection = new SqlConnection(connectionString))
{
    connection.Open();
    var command = new SqlCommand("SELECT Name FROM Users", connection);
    using (var reader = command.ExecuteReader())
    {
        while (reader.Read())
        {
            Console.WriteLine(reader.GetString(0));
        }
    }
}