简单的图片飘C#(Winform)

        public partial class Form1 : Form
            {
                public int x1 = 8;
                public int x2 = 148;
                public int x3 = 248;
                public int x4 = 348;

                public Form1()
                {
                    InitializeComponent();
                }

                private void Form1_Load(object sender, EventArgs e)
                {
                    this.timer1.Enabled = true;
                    this.timer2.Enabled = true;
                    this.timer3.Enabled = true;
                    this.timer4.Enabled = true;
                }

                private void timer1_Tick(object sender, EventArgs e)
                {
                    pictureBox1.Location = new Point(x1,8);
                    x1 += 1;
                    if (x1 >= this.Size.Width)
                    {
                        x1 = 0;
                    }
                }

                private void timer2_Tick(object sender, EventArgs e)
                {
                    pictureBox2.Location = new Point(x2,56);
                    x2 += 1;
                    if (x2 >= this.Size.Width)
                    {
                        x2 = 0;
                    }

                }

                private void timer3_Tick(object sender, EventArgs e)
                {
                    pictureBox3.Location = new Point(x3,112);
                    x3 += 1;
                    if (x3 >= this.Size.Width)
                    {
                        x3 = 0;
                    }
                }

                private void timer4_Tick(object sender, EventArgs e)
                {
                    pictureBox4.Location = new System.Drawing.Point(x4,176);
                    x4 += 1;
                    if (x4 >= this.Size.Width)
                    {
                        x4 = 0;
                    }
                }
            }