Class file
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    class inheritanc
    {
        private int mibalance;
        public int balance
        {
            get
            {
                return mibalance;

            }
            set
            {
                mibalance = value;
            }
        }
    }

    class inher : inheritanc
    {
        public void deposit(int amt)
        {
            balance = balance + amt;
        }
        public void withdraw(int amt)
        {
            balance = balance - amt;
        }
    }
}

Windows form file
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class inheritance : Form
    {
        public inheritance()
        {
            InitializeComponent();
        }

   

        private void inheritance_Load(object sender, EventArgs e)
        {
            inheritanc kk=new inheritanc();
            MessageBox.Show(kk.balance.ToString());
        }
    }
}