Integrating C# with databases using ADO.NET

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Integrating C# with databases using ADO.NET

ADO.NET is a powerful data access technology that enables you to connect to a variety of data sources, execute queries and commands, and retrieve results. With ADO.NET, you can:

  • Connect to a variety of data sources, including SQL Server, Oracle, and Excel.
  • Execute commands and queries against a database, such as SELECT, INSERT, UPDATE, DELETE, and stored procedures.
  • Retrieve and manipulate data using a variety of data readers and data sets.
  • Transmit data between data sources and applications using data-aware controls and custom code.
  • Asynchronously execute commands and queries for better performance and scalability.

ADO.NET is a key part of the .NET Framework, and it is a powerful tool for accessing and manipulating data in your .NET applications.

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ADO.NET Integration

To use ADO.NET to connect to a database from C#, you will need to:

  1. Import the necessary namespaces:
    using System.Data;
    using System.Data.SqlClient;
  2. Establish a connection to the database:
    string connectionString = "Server=myServerAddress;Database=myDataBase;User ID=myUsername;Password=myPassword;";
    SqlConnection connection = new SqlConnection(connectionString);
    connection.Open();
  3. Create a command to execute on the database:
    string queryString = "SELECT * FROM Customers WHERE Country = 'Mexico'";
    SqlCommand command = new SqlCommand(queryString, connection);
  4. Execute the command and process the results:
    SqlDataReader reader = command.ExecuteReader();
    while (reader.Read())
    {
        Console.WriteLine(reader[0].ToString() + " - " + reader[1].ToString());
    }
  5. Close the connection:
    connection.Close();

There are many other features and options available in ADO.NET, but these are the basic steps for executing a simple query and processing the results.

ADO.NET Core Components

ADO.NET is based on a disconnected model, which means that you can retrieve data from a data source and work with it in your application without maintaining an open connection to the data source. This can improve performance and scalability because you don’t have to keep a connection open for the entire duration of your application.

The main components of the ADO.NET model are:

  • Connection: A connection object represents a connection to a data source. You use a connection object to open and close a connection to a data source.
  • Command: A command object represents a command that you want to execute on a data source. You can use a command object to execute a variety of commands, including SELECT, INSERT, UPDATE, DELETE, and stored procedures.
  • DataReader: A data reader is a forward-only, read-only cursor that you can use to retrieve data from a data source. Data readers are efficient because they retrieve data one record at a time as you iterate through them.
  • DataSet: A data set is an in-memory cache of data that you can use to store and manipulate data from a variety of sources. A data set is a disconnected data model, which means that you can work with data in the data set without maintaining an open connection to the data source.

These are the main components of the ADO.NET model, and you can use them to build powerful data-driven applications in C#.