//没有标题
            this.FormBorderStyle = FormBorderStyle.None;
            //任务栏不显示
            this.ShowInTaskbar = false;

//实现拖动

1.在窗体类里面加入,下面两个,按提示加入命名空间

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern bool ReleaseCapture();

2.拖动一个panel然后,闪电事件中加入下面代码,实现拖动
private void panel1_MouseDown(object sender, MouseEventArgs e)//在panel1中添加mouse_down事件
{
　　const int WM_NCLBUTTONDOWN = 0x00A1;
　　const int HTCAPTION = 2;

　　if (e.Button == MouseButtons.Left) // 按下的是鼠标左键
　　{
　　　　ReleaseCapture();
　　　　SendMessage(this.Handle, WM_NCLBUTTONDOWN, (IntPtr)HTCAPTION, IntPtr.Zero); // 拖动窗体
　　}
}

//形状实现

最小化

private void button4_Click(object sender, EventArgs e)
{
　　this.WindowState = FormWindowState.Minimized;
}

最大化

private void button5_Click(object sender, EventArgs e)
{
　　this.WindowState = FormWindowState.Maximized;
}

关闭

private void button6_Click(object sender, EventArgs e)
{
　　this.Close();
}