Simple Snack Machine Coded in 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;

namespace Snack_Machine
{
    public partial class frmSnackMachine : Form
    {
        double price = 0.00;
        public frmSnackMachine()
        {
            InitializeComponent();
        }

        private void btnChips_Click(object sender, EventArgs e)
        {
            price = price + 0.50;
            lblMoneyOwed.Text = price.ToString();

        }

        private void btnSourCandy_Click(object sender, EventArgs e)
        {
            price = price + 0.75;
            lblMoneyOwed.Text = price.ToString();
        }

        private void btnChocolate_Click(object sender, EventArgs e)
        {
            price = price + 1.00;
            lblMoneyOwed.Text = price.ToString();
        }

        private void btnClearChoices_Click(object sender, EventArgs e)
        {
            price = 0.00;
            lblMoneyOwed.Text = price.ToString();
        }

        private void btnInsertMoney_Click(object sender, EventArgs e)
        {
            double givenAmount = double.Parse(txtTypeAmount.Text);
            price = price - givenAmount;
            lblMoneyOwed.Text = price.ToString();
            if (givenAmount < price)
                MessageBox.Show("Please insert more money");
            if (givenAmount >= price)
                MessageBox.Show("Snack dispensing. Thank you and come again!");

        }

        private void btnGetChange_Click(object sender, EventArgs e)
        {
            double change = price;
            MessageBox.Show("Change Dispensed");
            price = price - price;
            lblMoneyOwed.Text = price.ToString();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}