Common operations form controls
A control is selected, then press Ctrl click another control (at this time is the second edit controls, when a plurality of controls Kuangxuan selected, the edit controls anchor black)
Code UN UN top and bottom:
The control identifier .BringToFront ();
The control identifier .SendToBack ();
In the positioning control of the position code:
Control identifier .Location = new System.Drawing.Point (100,99);