Please help to solve this Error

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions ;

namespace bank
{
    class account
    {
        private float balance;
        public void Deposite(float amount)
        {
            balance+=amount;
        }
        public void withdraw(float amount)
        {
            balance-=amount;
        }
        public void TransferFunds(account destination, float amount)
        {
        }
        public float Balance
        {
            get
            {
                return balance;
            }
        }
        public static void testmethod()// from here i am writing testcode which i want to run in Nunit but in this Assert.AreEqual is also not supporting   
        {
            account a1 = new account();
            a1.Deposite(200.00f);
            account a2 = new account();
            a2.Deposite(15.00f);
            a1.TransferFunds(a2, 100.00f);
            account.Equals(250.00f, a2.balance);
            account.Equals(100.00f, a1.balance);
        }
    }
}