Question

A page containts custom address control and checkBox. Why does the second example of code work properly, but first doesn’t?

//1
protected void Page_Init(object sender, EventArgs e)
{
  //doesn't work properly
   ucLegalAddress.Visible = !chkLegalAddress.Checked;
}


 //2
 protected void Page_Load(object sender, EventArgs e)
  {
    //works properly
     ucLegalAddress.Visible = !chkLegalAddress.Checked;
   }

Answer 1

Because the viewstate of the controls is loaded between the init and the load event. This means that the init event does not know the state of the client yet.

MSDN lifecycle overview