C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OleDb;

namespace Login
{
    public partial class Registration : Form
    {
        private OleDbConnection connection = new OleDbConnection();
        public Registration()
        {

            InitializeComponent();
            connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=F:\VB projects\Project\DataBase\OnlineRetailDataBase.accdb;
            Persist Security Info=False;";
         
        }

        private void btn_Submit_Click(object sender, EventArgs e)
        {
            try
            {
                connection.Open();
                OleDbCommand command = new OleDbCommand();
                command.Connection = connection;
                command.CommandText = "INSERT into OnlineRetailDataBase (FirstName, SurName, DateOfBirth, Gender, BankName, BankAccountNumber, Email, Password) VALUES ('" + txt_Fname.Text + "','" + txt_Surname.Text + "','" + txt_dob.Text + "','" + txt_Gender.Text + "','" + txt_Bname.Text + "','" + txt_ban.Text + "','" + txt_Email.Text + "','" + txt_Password.Text + "',)";
                command.ExecuteNonQuery();
                MessageBox.Show("You Now Registered, Please Login");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error" + ex);
                connection.Close();
            }
 }

        private void txt_Fname_TextChanged(object sender, EventArgs e)
        {

        }
 }
}