要调用endgame这个方法再哪调用了？是在哪个事件里吗？

namespace game
{
    public partial class Form1 : Form
    {
        int xdd1 = 0;//定义lbl1图片x方向的增量
        int ydd1 = 0;//定义lbl1图片y方向的增量
        int xdd2 = 0;//定义lbl2图片x方向的增量
        int ydd2 = 0;//定义lbl2图片y方向的增量
        int xdd3 = 0;//定义lbl3图片x方向的增量
        int ydd3 = 0;//定义lbl3图片y方向的增量
        int xdd4 = 0;//定义lbl4图片x方向的增量
        int ydd4 = 0;//定义lbl4图片y方向的增量
        int times = 0;//声明一个变量        public Form1( )
        {
            
            InitializeComponent();
        }        //鼠标按下事件
        Point p = new Point();//用对象表示鼠标的坐标
        Point cp = new Point();//用对象表示图片的坐标
        private void lblclick_MouseDown(object sender, MouseEventArgs e)
        {
            p.X = Cursor.Position.X;//鼠标的横坐标
            p.Y = Cursor.Position.Y;//鼠标的纵坐标
            cp.X = lblclick.Location.X;//lblclick的横坐标
            cp.Y = lblclick.Location.Y;//lblclick的纵坐标
            timer1.Enabled = true;//启用timer
            
        }        //黄图片随鼠标移动而移动
        private void lblclick_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button.Equals(MouseButtons.Left)) // 点左键移动
            {
                lblclick.Location = new Point(Cursor.Position.X - (p.X - cp.X), Cursor.Position.Y - (p.Y - cp.Y));
            }
            
        }        
        //timer事件
        int mod = 1;
        private void timer1_Tick(object sender, EventArgs e)
        {
          
            times++;
            if (times % mod == 0)
            {
                Random ran = new Random();//产生随机数
                xdd1 = ran.Next(20) ;
                ydd1 = ran.Next(40) ;
                xdd2 = ran.Next(-20,-10) ;
                ydd2 = ran.Next(20) ;
                xdd3 = ran.Next(30) ;
                ydd3 = ran.Next(-30,-10) ;
                xdd4 = ran.Next(-40,-10) ;
                ydd4 = ran.Next(-30,-10) ;                mod = ran.Next(100,400) ;
               
            }
            //四个木块自己移动
            if (lbl1.Location.X <= 1)
            {
                xdd1 = 10;
                ydd1 = 0;
            }
            if (lbl1.Location.Y <= 1)
            {
                xdd1 = 0;
                ydd1 = 2;
            }
            if (lbl1.Location.X >= 351)
            {
                xdd1 = -5;
                ydd1 = 0;
            }
            if (lbl1.Location.Y >= 358)
            {
                xdd1 = 0;
                ydd1 = -2;
            }
            lbl1.Location = new Point(lbl1.Location.X + xdd1, lbl1.Location.Y + ydd1);
            if (lbl2.Location.X <= 1)
            {
                xdd2 = 7;
                ydd2 = 0;
            }
            if (lbl2.Location.Y <= 1)
            {
                xdd2 = 0;
                ydd2 = 6;
            }
            if (lbl2.Location.X >= 382)
            {
                xdd2 = -8;
                ydd2 = 0;
            }
            if (lbl2.Location.Y >= 384)
            {
                xdd2 = 0;
                ydd2 = -2;
            }
            lbl2.Location = new Point(lbl2.Location.X + xdd2, lbl2.Location.Y + ydd2);
            if (lbl3.Location.X <= 1)
            {
                xdd3 = 4;
                ydd3 = 0;
            }
            if (lbl3.Location.Y <= 1)
            {
                xdd3 = 0;
                ydd3 = 8;
            }
            if (lbl3.Location.X >=410)
            {
                xdd3 = -6;
                ydd3 = 0;
            }
            if (lbl3.Location.Y >= 374)
            {
                xdd3 = 0;
                ydd3 = -2;
            }
            lbl3.Location = new Point(lbl3.Location.X + xdd3, lbl3.Location.Y + ydd3);
            if (lbl4.Location.X <= 1)
            {
                xdd4 = 6;
                ydd4 = 0;
            }
            if (lbl4.Location.Y <= 1)
            {
                xdd4 = 0;
                ydd4 = 2;
            }
            if (lbl4.Location.X >= 317)
            {
                xdd4 = -5;
                ydd4 = 0;
            }
            if (lbl4.Location.Y >= 420)
            {
                xdd4 = 0;
                ydd4 = -8;
            }
            lbl4.Location = new Point(lbl4.Location.X + xdd4, lbl4.Location.Y + ydd4);
            
        }        //判断游戏结束的
        public void endgame()
        {
            if (((label1.Location.X - lblclick.Location.X <= 100 | lblclick.Location.X - lbl1.Location.X <= 52) && (lbl1.Location.Y - lblclick.Location.Y <= 90 | lblclick.Location.Y - lbl1.Location.Y <= 49)) | ((lbl2.Location.X - lblclick.Location.X <= 69 | lblclick.Location.X - lbl2.Location.X <= 52) && (lbl2.Location.Y - lblclick.Location.Y <= 64 | lblclick.Location.Y - lbl2.Location.Y <= 49)) | ((lbl3.Location.X - lblclick.Location.X <= 41 | lblclick.Location.X - lbl3.Location.X <= 52) && (lbl3.Location.Y - lblclick.Location.Y <= 73 | lblclick.Location.Y - lbl3.Location.Y <= 49)) | ((lbl4.Location.X - lblclick.Location.X <= 134 | lblclick.Location.X - lbl4.Location.X <= 52) && (lbl4.Location.Y - lblclick.Location.Y <= 28 | lblclick.Location.Y - lbl4.Location.Y <= 49)) | (lblclick.Location.X <= 51 | lblclick.Location.X >= 349 | lblclick.Location.Y <= 49 | lblclick.Location.Y >= 349))
            {
                timer1.Enabled = false;//游戏结束               
            }
        }
                 }
}