validate a textbox on textchanged but not on keypress

Question

I am using Textbox_Validating event to validate a textbox on one of my window form. I wanted to validate the textbox, if the text of the texbox changes. So I called the validating event from the textbox_Texchanged event. But it has a sideffect as soon as I press a key it fires the textchanged event and hence the text_Validating event. I want to block the call to Text_Validating if the text property has changed due to keypress. But if someone assings txtbox.Text="asdf";, I want to fire validating event in this case.

private void txt8Ydere1_TextChanged(object sender, EventArgs e)
    {
        txt8Ydere1_Validating(sender,null);
    }

Answer 1

I would use the LostFocus event for the textbox. You could run your validation from that event.

See the msdn for more info.

Answer 2

you can block the call to validating event by doing this

txt8Ydere1.Validating-=txt8Ydere1_Validating;

place this code in keydown,keyUp events...

Check for txtbox.Text equals "asdf" and if so you can directly call the Validating method without resubscribing to the event:

txt8Ydere1_Validating(sender,null);