How to use foreach to traverse all the textbox on the page

Traverse | Page 1. The whole page is judged
foreach (Control ctl. CONTROLS[1]. Controls)
{
if (CTL. GetType (). name== "TextBox")
{
TextBox TB =new textbox ();
tb= (TextBox) this. FindControl (ctl.id);

if (TB. Text==string. Empty)
{
The value of Response.Write ("<script>alert + ctl.id +" is empty. ');</script> ");
Break
}
}
}

2. Specify Formid in the textbox to judge

Find out the ID of your form first.
protected HtmlForm Yourformid;

foreach (Object obj in Yourformid.controls)
{
if (obj is TextBox)
{
TextBox TB = (textbox) obj;
if (TB. Text = string. Empty)
{
The value of Response.Write ("<script>alert + tb.id +" is empty. ');</script>; ")
}
}
}