MainScreen.cs

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 Harmony_Player
{
    public partial class MainScreen : Form
    {

        public MainScreen()
        {
            InitializeComponent();
        }

        private void Close_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        private void Maximize_Click(object sender, EventArgs e)
        {
            if (WindowState == FormWindowState.Normal)
            {
                MaximizedBounds = Screen.FromHandle(Handle).WorkingArea;
                WindowState = FormWindowState.Maximized;
            }
            else
            {
                WindowState = FormWindowState.Normal;
            }
        }


        private void Minimize_Click(object sender, EventArgs e)
        {
            WindowState= FormWindowState.Minimized;
        }

        private void Close_MouseEnter(object sender, EventArgs e)
        {
            Close.BackColor = Color.Red;
        }

        private void Close_MouseLeave(object sender, EventArgs e)
        {
            Close.BackColor = Color.Black;
        }

        private void Maximize_MouseEnter(object sender, EventArgs e)
        {
            Maximize.BackColor = Color.Gray;
        }

        private void Maximize_MouseLeave(object sender, EventArgs e)
        {
            Maximize.BackColor = Color.Black;
        }

        private void Minimize_MouseEnter(object sender, EventArgs e)
        {
            Minimize.BackColor = Color.Gray;
        }

        private void Minimize_MouseLeave(object sender, EventArgs e)
        {
            Minimize.BackColor = Color.Black;
        }

    }
}