What are the main differences between using Entity Framework and ADO.NET when working with databases?

Entity Framework (EF) and ADO.NET are two different approaches to working with databases in .NET, distinguished by their level of abstraction and ease of use.

• Level of abstraction:

  • ADO.NET is a low-level API for database interaction, requiring manual writing of SQL queries, managing connections, commands, and reading data through DataReader or DataSet.
  • Entity Framework is an ORM (Object-Relational Mapper) that allows working with the database through objects and LINQ queries, automatically generating SQL and managing relationships.

• Productivity: EF speeds up development by automating many routine tasks, whereas ADO.NET requires more code and attention to detail.

• Performance: ADO.NET is usually faster as it works directly with SQL and minimizes overhead, while EF can be slower due to the additional abstraction layer.

• Flexibility: ADO.NET provides full control over SQL and query optimization, while EF is limited to ORM capabilities, although it supports writing custom SQL when necessary.

Example of using ADO.NET:

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

Example of using Entity Framework:

using(var context = new MyDbContext())
{
    var users = context.Users.ToList();
    foreach(var user in users)
    {
        Console.WriteLine(user.Name);
    }
}