using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Threading;

namespace Example
{

    public class YourClass
    {
        public int Some1 { get; set; }
        public int Some2 { get; set; }
    }

    public interface IIntefacee
    {
        public void AddYourClass(YourClass yourClass);
        public YourClass[] GetYourClassArray();
    }

    public class MyDataManager : IIntefacee
    {
        public void AddYourClass(YourClass yourClass)
        {
            //Здесь добавляем в бд
        }

        public YourClass[] GetYourClassArray()
        {
            //Здесь берем данные из бд
            return new YourClass[0]; //Сделал заглушку
        }
    }

    public class Form1
    {
        private IIntefacee DataManager;
        public Form1(IIntefacee DataManager)
        {
            this.DataManager = DataManager;
        }
        private void Button1_click()
        {
            var variable = DataManager.GetYourClassArray();
            //Делаем что-то с данными из бд
        }
        private void Button2_click()
        {
            var variable = new YourClass();
            DataManager.AddYourClass(variable);
            //Добавили в бд
        }
    }

    class Program
    {
        static void Main()
        {
            MyDataManager myDataManager = new MyDataManager();
            Form1 form = new Form1(myDataManager);
        }
    }
}