关于多个pictureBox图片按特定顺序闪烁显示的问题(既达到轨迹效果)大家帮忙看看.

win程序,大家帮忙想想怎么办.
 长方形四个角有pictureBox1到pictureBox4四张图片 分别是命名pictureBox1 pictureBox2 pictureBox3 pictureBox4 
现在从数据库中的到图片按3 1 2 4 3顺序依次闪烁；每张图闪四次或五次
如长方形一个角中pictureBox3闪烁几次，然后是pictureBox１闪烁几次，再到pictureBox２闪烁几次 再到pictureBox4闪烁几次　　最后到pictureBox3闪烁几次在停止。
            
具体代码如下；问题是因为没有延时，在界面上效果就只是所有图片同时一闪,然后没有变化了。
        
private void button1_Click(object sender, EventArgs e)
    {
         。。
string sendStrSQL = "SELECT ＊ from 图片表 where 地点 = '" + comboBox1.Text + "' ORDER BY 时间 ASC";
      DataTable tempDataTable = datalink.SelectDataBase(sendStrSQL);
     for (int i = 0; i < tempDataTable.Rows.Count; i++)//取进出记录 3124
     {                    
          string tempplace = tempDataTable.Rows[i][6].ToString().Trim();//位置图片名
           for (int j = 0; j < 5; j++)//每个图片闪烁次数
           {
            switch (tempplace)//位置图片名
                 {
                   case "1"://pictureBox1图片                                   
                    if (pictureBox1.Visible == true)
                     {
                      pictureBox1.Visible = false;                                        
                      }
                      else
                      {
                     pictureBox1.Visible = true;                                       
                      } 
                                  
      //我在这里试过System.Threading.Thread.Sleep(3000);来延时，没有达到效果
     //也试过用函数做很大的循环来控制，　Delay(90000000);然后自减到0　也没有达到效果　
   //我想过用四个timer1来分别启动每个图片的Visible的属性，但是这个顺序不好控制，结果是四个一起闪
 //还有就是把这个图片顺序放到aaa[j]中，然后用一个timer控制相应的图片闪，结果是速度太快，感觉不到在闪。
                                  break;
               case "2": //pictureBox2图片                                   
              if (pictureBox2.Visible == true)
               {
                pictureBox2.Visible = false;                                       
               }
                 else
               {
              pictureBox2.Visible = true;                                       
                                    }                                   
                        break;
            case "3"://pictureBox3图片                                     
               if (pictureBox3.Visible == true)
                       {
                  pictureBox3.Visible = false;                                       
                         }
                    else
                {
                 pictureBox3.Visible = true;                                       
                    }                                    
                              break;
           case "4": //pictureBox4图片                                   
                if (pictureBox4.Visible == true)
                          {
               pictureBox4.Visible = false;                                        
                       }
                   else
                        {
                pictureBox4.Visible = true;                                       
                               }                                   
                                break;
                            }
                        } 
                    }        
                    
                }大家不要嫌分少,可以加的.