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();