Validating email c
The masking language that is used by Masked Text Box is very flexible.It allows you to specify required characters, optional characters, literal characters, such as hyphens and parentheses, currency characters, and date separators.An email address is a string of a subset of ASCII characters separated into two parts by an @ symbol . Is Match Method (String, String) - indicates whether the specified regular expression finds a match in the specified input string.The part before the @ sign is the local part of the address, and the part after the @ sign is a domain name to which the email message will be sent . The pattern parameter consists of various regular expression language elements that symbolically describe the string to match pattern .The following code example uses the derived class Text Box and validates an email address that the user enters. Length) ' Set the Error Provider error with the text to display. Set Error(text Box1, error Msg) End If End Sub Private Sub text Box1_Validated(By Val sender As Object, _ By Val e As System. Validated ' If all conditions have been met, clear the error provider of errors. Set Error(text Box1, "") End Sub When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.
In the Validating event-handling method, you can validate user input in several ways.
When you use data binding, the data in your control is synchronized with the data source during execution of the Validating event.
If you cancel the Validating event, the data will not be synchronized with the data source.
Important If you have custom validation that takes place after the Validating event, it will not affect the data binding.
For example, if you have code in a Validated event that attempts to cancel the data binding, the data binding will still occur.