run my method only wen der's an error in createuserwizard while creating user??

i am running this method wen someone clicks on creatuser wizard createuser button


Protected void Page_Load(object sender, EventArgs e)
{
foreach (Control ctrl in CreateUserWizard1.Controls) {
FindButtons(ctrl);
}
}
but i want to run it only when der is sm validation error in creating user smthing like protected void


Page_Load(object sender, EventArgs e)
{
if ( CreateUserWizard.createusererror!=null) {
 foreach (Control ctrl in CreateUserWizard1.Controls)
{
FindButtons(ctrl);
}
}
}


how to do that..??
...