custom validator working when i post it in the same page, however if i post to a different page it does not fire.

Question 1:
I am using a custom validator and when i post it in the same page it works and fires, however if i post to a different page it does not fire. Here is the code below.

Question2:
Also what is the best place to write the code for redirecting to the next page? in the action="pagename.aspx" or in the postbackurl="" of the button


 

 
 

 
 
 
 

 
 

 
 

 
 
 
 





Code Behind

  protected void Custom_Validator_Prepayment(object s, ServerValidateEventArgs args)
  {

  if ((Session["id"] == null) || (Type.SelectedIndex == 0))
  {
  args.IsValid = false;
  Response.Redirect("default.aspx");
  }
  else
  {
  args.IsValid = true;
  }
  }

  protected void  button1_Click(object sender, EventArgs e)
  {

  //Page.Validate();
  if (!Page.IsValid)
  {
  Response.Redirect("../settings/studentmanager/default.aspx");
  }

}