int x = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Width - this.Size.Width - ;
int y = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Height - this.Size.Height - ;
this.SetDesktopLocation(x, y);
注释：
System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Width; //当前显示器的宽度
System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Height; //当前显示器的高度
this.SetDesktopLocation(x,y); //设置窗体打开后在显示器上的坐标