Tight And Loose Coupling C#

using System; 
  
public class SQLDataAccess { 
    public void ExecuteQuery(string query) { 
        Console.WriteLine(query); 
    } 
} 
  
public class ConsumerClass { 
    SQLDataAccess _dal; 
    public ConsumerClass(SQLDataAccess dal) { 
        this._dal = dal; 
    } 
  
    public void Execute() { 
        _dal.ExecuteQuery("Executing SQLDataAccess query"); 
    } 
} 
  
class Program { 
    static void Main(string[] args) { 
        ConsumerClass cc = new ConsumerClass(new SQLDataAccess()); 
        cc.Execute(); 
        Console.ReadKey(); 
    } 
} 

using System; 
  
public interface IDatabase { 
    void ExecuteQuery(string query); 
} 
  
public class SQLDataAccess: IDatabase { 
    public void ExecuteQuery(string query) { 
        Console.WriteLine("SQLServer query"); 
    } 
} 
  
public class MySQLDataAccess: IDatabase { 
    public void ExecuteQuery(string query) { 
        Console.WriteLine("MySQL query"); 
    } 
} 
  
public class ConsumerClass { 
    IDatabase _dal; 
    public ConsumerClass(IDatabase dal) { 
        this._dal = dal; 
    } 
  
    public void Execute() { 
        _dal.ExecuteQuery("Executing query"); 
    } 
} 
  
class Program { 
    static void Main(string[] args) { 
        ConsumerClass cc = new ConsumerClass(new SQLDataAccess()); 
        cc.Execute(); 
  
        cc = new ConsumerClass(new MySQLDataAccess()); 
        cc.Execute(); 
  
        Console.ReadKey(); 
    } 
} 

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