控制控件上下左右移动

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace 移动
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button3_Click(object sender, EventArgs e)
{
//上
if (label1.Top < 0)
{
label1.Top=this.Height;//如过小于窗体上边缘则返回底层
}
int y = label1.Location.Y - 20;
label1.Location = new Point(label1.Location.X, y);

}
private void Ybutton2_Click(object sender, EventArgs e)
{
//右
if (label1.Right >= this.Width)
{
label1.Left = 0;//如过大于窗体返回左边
}
int i = label1.Location.X + 20;
label1.Location = new Point(i, label1.Location.Y);
}

private void ZUObutton1_Click(object sender, EventArgs e)
{ //左
if (label1.Left < 0)
{
label1.Left= this.Width;
}
int i = label1.Location.X - 20;
label1.Location = new Point(i, label1.Location.Y);
}

private void Xbutton4_Click(object sender, EventArgs e)
{ //下
if (label1.Bottom >this.Height)
{
label1.Top = 0; ;//如过大于窗体返回窗体顶层
}
int y = label1.Location.Y + 20;
label1.Location = new Point(label1.Location.X, y);
}
}
}