I have the following 2 queries:

1) I have a maintenance form with 2 bound textboxes, 1 textbox for a db field name (textBox1) and the other for a friendly display name (textBox2). During New i would like the friendly name to be the mirror of the field name whilst the user is inputting the data. I have set. In the Change event on textBox1 I set

     textBox2.Text = textBox.Text

When I run the app and attempt to create a new record, I enter a character into textBox1 the change event is invoked and the data is copied to textBox2 but then the character is obliterated. Any subsequent keypress results in a blank textBox1 and textBox2. I have noticed that there seems to be multiple calls to the change event when a single key is pressed.  Does anyone have an explanation for this?

2) When I update a new record I get the error "Cannot insert the value NULL into config_pk etc. I have the properties on the PrimaryKeyIsAtoIncremented= True and PrimaryKeyIsUpdateable= false. Is there another property that I should look out for?

many thanks