When setting the data types of your database fields one of the data types available is the Text type.
Using Text as your data type will allow: Text or combinations of text and numbers, such as addresses.
Also numbers that do not require calculations, such as phone numbers, part numbers, or postal codes.
The Common Language Runtime (CLR) represents all errors as exceptions. The Framework class library (FCL) includes a large number of standard exception classes that encapsulate information about common errors.
A network link to a server might fail just as you're transferring data.
Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems.
The following code example uses the derived class Text Box and validates an e-mail address that the user enters.
If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.