winform调试问题？？

为什么每次调试进入Form1_Paint（）都要执行两遍才会出现form框架。然后form就迅速最小化在调出来点也没什么反映。就一直反复做这个函数
   private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            
            point[i].X = e.X;
            point[i].Y = e.Y;
            if (i < N)
            {
                rb[i] = new RadioButton();
                rb[i].Location = point[i];
                this.Controls.Add(rb[i]);
            }
            i++;
            //this.Refresh();
        }        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            int k=0;
            j = 0;
            gg = e.Graphics;                //创建画板,这里的画板是由Form提供的.                                              
            ////SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);//画刷
            p.DashStyle = DashStyle.Solid;                       //定义实线
            p.EndCap = LineCap.ArrowAnchor;                     //定义线尾的样式为箭头
            while (k < N)
            {              
                //gg.FillEllipse(myBrush, new Rectangle(point[j].X, point[j].Y, 10, 10));//画实心椭圆
                gg.DrawLine(p, point_edge[j].X, point_edge[j].Y, point_edge[j+1].X, point_edge[j+1].Y);
                j++;
                k++;
            }          
        }        private void button1_Click(object sender, EventArgs e)
        {
            int k = 0;
            foreach(RadioButton rabu in rb)
            {
                if (rabu.Checked)
                {
                    point_edge[k] = rabu.Location;
                    k++;
                }
            }
WinForm调试