I want to define the Label text dynamically from database, and loop all the Label contorl in the content.
How can i put the Page_Load function to all of my page?
foreach (Control ctrl in Page.Controls)
{
foreach (Control ctrl0 in ctrl.Controls)
{
//ctrl0

if (ctrl0.GetType() == typeof(Label))
//Load DB text
ctrl0.Text = db.Text;
}

}

Be careful with this as you'll quickly find out that if you bind to a repeater none of your labels will show. Something like the following would be my guess.

LabelFromDB(control parent)
{
foreach(control c in parent.controls)
{
if(c.HasControls)
{
LabelFromDB(c);
}
}
}

You'll also want a check to see if c is a label and if so fill it with text.