C# panel 动态添加PictureBox 排列的问题！


        private static int GroupId = 1; int Column = 4; int Row = 1;
        private static int x1 = 0; int x2 = 120; int x3 = 140;
        private static int y1 = 0; int y2 = 0; int y3 = 0;        public Form3()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            PictureBox p = new PictureBox();
            p.BorderStyle = BorderStyle.FixedSingle;            p.Image = objImage; //Image.FromFile(@"D:\wubw\AutoCity.UploadImages\AutoCity.UploadImages\bin\Debug\0.jpg");
            p.Name = "pbx" + GroupId;
            this.panel1.Controls.Add(p);            TextBox t = new TextBox();
            t.Name = "tb" + GroupId;
            panel1.Controls.Add(t);            Button b = new Button();
            b.Name = "bt" + GroupId;
            b.Text = "浏览";
            b.MouseDown += new MouseEventHandler(this.ButtonArray_OnClick);
            panel1.Controls.Add(b);            Button del = new Button();
            del.Name = "del" + GroupId;
            del.Text = "删除";
            del.MouseDown += new MouseEventHandler(this.ButtonArraydel_OnClick);
            panel1.Controls.Add(del);            
            SetControlsLocation();  
            GroupId++;
        }        private bool ThumbnailCallBack()
        {
            return false;
        }        private void SetControlsLocation()
        {
            this.panel1.Hide();            int btWidth = 45; int pbxWidth = 150;            int w = 0;             //int p = GroupId % Column;
            //if (GroupId % Column == 0)
            //{
            //    x1 += 180;
            //    y1 = 0;
            //}            foreach (Control tmpCtr in panel1.Controls)
            {
                w++;
                if (tmpCtr.Text == "添加新图片")
                {
                    continue;
                }                if (tmpCtr.Name == "pbx" + GroupId)
                {
                    tmpCtr.Top = x1;
                    tmpCtr.Left = y1;
                    tmpCtr.Width = pbxWidth;
                    tmpCtr.Height = 120;
                }
                if (tmpCtr.Name == "tb" + GroupId)
                {
                    tmpCtr.Top = x2;
                    tmpCtr.Left = y2;
                    tmpCtr.Width = pbxWidth;
                }                if (tmpCtr.Name == "bt" + GroupId)
                {
                    tmpCtr.Top = x3;
                    tmpCtr.Left = y3;
                    tmpCtr.Height = 25;
                    tmpCtr.Width = btWidth;
                }                if (tmpCtr.Name == "del" + GroupId)
                {
                    tmpCtr.Top = x3;
                    tmpCtr.Left = y3+btWidth;
                    tmpCtr.Height = 25;
                    tmpCtr.Width = btWidth;
                }                tmpCtr.BringToFront();
                
            }
            y1 += pbxWidth + 5;
            y2 += pbxWidth + 5;
            y3 += pbxWidth + 5;
            button1.Left = y1 + 50;
            button1.Top = x1;                if ((GroupId % Column) == 0 && GroupId/Column == Row)
                {
                    x1 += 180; x2 += 180; x3 += 180;
                    y1 = 0; y2 = 0; y3 = 0;
                    Row++;
                }                //MessageBox.Show(x1.ToString());
           this.panel1.Show();
        }
排列的时候出现错误，谁帮我看看，先谢谢了.