asp.net the control's name value automatically after the control is built

ASP tutorial. NET build control automatically gets the name value of the control
Convenient with the Tag property of the control

private void Message (Object Sender,eventargs e)
{
PictureBox pic = sender as PictureBox;
String Lblname= ((label) pic.tag). Name;
MessageBox.Show (Lblname);
}
When the control is dynamically generated, specify name, and then locate it:

foreach (Control ct in form1.controls)
{
C # only traverses the child controls of the form and does not traverse the sun control
When a control on a form has child controls, you need to iterate recursively to list all the controls on the form
if (ct.name== "")
{

}
}
}

Instance

PictureBox p = new PictureBox ();
P.name = "P" + i.tostring ();
P.sizemode = System.windows.forms.pictureboxsizemode.stretchimage;
P.imagelocation = @ "D:www.111cn.nethome4.png";
P.size = New System.Drawing.Size (60, 60);
P.location = New System.Drawing.Point (5 * i-60, 50);
P.cursor = System.windows.forms.cursors.hand;
P.doubleclick + + new EventHandler (message);
P.mousemove + = new System.windows.forms.mouseeventhandler (this.mouseo tutorial ver);
P.mouseleave + = new System.EventHandler (this.mouseo tutorial UT);
P.contextmenustrip = CONTEXTMENUSTRIP1;
This.sp_l_r.panel2.controls.add (P);
Label La = new label ();
La.name = "La" + i.tostring ();
La.text = "0000";
La.location = New System.Drawing.Point (50, 120);
                     This.sp_l_r.panel2.controls.add (LA);