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 ICSharpCode.WinFormsUI.Controls
{
 public partial class AboutForm : Form
 {
 public AboutForm()
 {
 InitializeComponent();
 }

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

 protected override void OnPaint(PaintEventArgs e)
 {
 base.OnPaint(e);

 ControlPaint.DrawBorder(e.Graphics, this.ClientRectangle,
 SystemColors.ControlDark, 1, ButtonBorderStyle.Solid, //左边
 SystemColors.ControlDark, 1, ButtonBorderStyle.Solid, //上边
 SystemColors.ControlDark, 1, ButtonBorderStyle.Solid, //右边
 SystemColors.ControlDark, 1, ButtonBorderStyle.None);//底边

 }
 }
}