asp.net - Panel.FindControl() method isn't finding a control that has been added to it -

consider following code, adding 2 textboxes same id (oops):

protected void page_load(object sender, eventargs e) {    string textboxname = "textbox1";     panel p = new panel();     textbox t = new textbox();    t.id = textboxname;    p.controls.add(t);     if (p.findcontrol(textboxname) == null) // <-------*******    {        textbox t2 = new textbox();        t2.id = textboxname;        p.controls.add(t2);    }     page.form.controls.add(p); } 

the code designed stop adding same id twice. however, panel.findcontrol() method not finding control added in previous line of code.

am using in wrong way?

i mean - sure - manually iterate through controls in next level, like:

string textboxname = "textbox1";  panel p = new panel();  textbox t = new textbox();  t.id = textboxname; p.controls.add(t);   textbox t2 = new textbox();   t2.id = textboxname;     bool duplicatefound = false;  foreach( control c in p.controls )  {        if(c.id == textboxname)         {        duplicatefound = true;        break;         }  }  if( duplicatefound )  {     t2.id = textboxname + "__0";     p.controls.add(t2);  } 

but don't understand why isn't working, whereas placeholder controls , usercontrols work fine.

the reason using panels css styling. body > div > input - still - isn't working.

this because panel p has not yet been added page. try adding page first, see happens.