鼠标点击调节窗体透明度

鼠标点击进度条，实时改变窗体透明度

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 透明度调节
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        int transparent = 0;//透明度
        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            panel2.Size = new Size(e.Location.X, 13);
           
            transparent = e.Location.X;
            ChangeTransparent(transparent);
            label1.Text = transparent.ToString() "%";