批量添加 PictureBox ，如何在click 或 mouseDown事件里取出该pictureBox的坐标？
for   (int   i   =   0;   i   <   project.GetLength(0);   i++)
{
//生成列头上的图标控件
PictureBox   onColumnPic   =   new   PictureBox();
onColumnPic.Name   =   controlName   +   i;
onColumnPic.Image   =   global::GridClass.Properties.Resources.筛选下拉箭头图标;
onColumnPic.SizeMode   =   System.Windows.Forms.PictureBoxSizeMode.AutoSize;
dataGridViewPoint.X   +=   Convert.ToInt16(project[i,3]);
onColumnPic.Location   =   dataGridViewPoint;
onColumnPic.Click   +=   new   System.EventHandler(this.pictureBox_Click);
onDGV.Controls.Add(onColumnPic);
}

private   void   pictureBox_Click(object   sender,   EventArgs   e)
{
          在这里有什么办法取出pictureBox坐标呢？
　　其实用pictureBox1.location.x     也可以取出，但我是批量添加的控件，怎么知道点的是哪个pictureBox呢？
}

------解决方案--------------------
private void pictureBox_Click(object sender, EventArgs e)
{
((pictureBox)sender).location.x...
}