Validating text box
In a Win Form I'm doing initial validation in the Form. To make the code short only three fields are shown in the code.
Validation Text Box passes its constraints object to the generating function.
The following code demonstrates a dynamic Validation Text Box that only accepts a 5 digit zip code after PM, and only accepts a county name before then.
If no other text object is selected, the system hides the keyboard; if, on the other hand, the user selects another text object, it becomes first responder and the keyboard for that object is displayed.
There are a couple of exceptions to this common behavior.
Server side validation is performed by a web server, after input has been sent to the server.