I am facing a problem in dynamically generated textbox with TextChange event. When I run the application and click in the box to insert text, the messagebox with the rezult shows at the first simbol which I insert. So i can't to analize all my string in textbox.
What to do?

TextChanged fires every time the value in the text box changes, so if you don't want to have a message box each time you press a key, you probably want to use something like a Leave or Validating event rather than TextChanged.