using System;

public interface ICommand

{

    int Execute();

}

​

public abstract class ServerCommand : ICommand

{

    public abstract int Execute();

}

​

public abstract class DataCommand : ServerCommand

{

    // some shit code here

}

​

public class ApplyChangesCommand : DataCommand

{

    public override int Execute()

    {

        // I need code executing here, before other code

        return 1;

    }

}

​

​

​

public class Program

{

    public static void Main()

    {

        var t = new ApplyChangesCommand();

    }

}