Validating event not being fired

I am using an error provider to validate a text box, my problem is the event is not being raised when I go to another field, why ?

Here is my code:

private void txtUserId_Validating(object sender, System.ComponentModel.CancelEventArgs e )
     string error = null;
     MessageBox.Show("What !");
     if ( this.txtUserId.Text.Length == 0 )
        error = "The userid is a mandatory field, please enter a userid.";
       e.Cancel = true;

   this.errorProvider1.SetError((Control) sender,error);
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rogaut1Author Commented:
and yes the CausesValidation property for txtUserid is set to true.
What does the event handler code ok?

this.object.event += new System.EventHandler(this.MethodName);

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rogaut1Author Commented:
That was the problem !   Thank you....the book I was reading never specified subcribing to the event.....

Thanks !

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