Validating email c
For example, if you have a text box that must contain a postal code, you can perform the validation in the following ways: The Validating event is supplied an object of type Cancel Event Args.
If you determine that the control's data is not valid, you can cancel the Validating event by setting this object's Cancel property to .
If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.
A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.
private: void text Box1_Validating( Object^ sender, System:: Component Model:: Cancel Event Args^ e ) void text Box1_Validated( Object^ sender, System:: Event Args^ e ) public: bool Valid Email Address( String^ email Address, [Out]interior_ptrprivate void text Box1_Validating(object sender, System. Cancel Event Args e) private void text Box1_Validated(object sender, System. Length = 0 Then error Message = "Email address is required." Return False End If ' Confirm that there is an "@" and a "." in the email address, and in the correct order. Cr _ "For example '[email protected]' " Return False End Function Private Sub text Box1_Validating(By Val sender As Object, _ By Val e As System. Text, error Msg) Then ' Cancel the event and select the text to be corrected by the user. 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.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.
When you use data binding, the data in your control is synchronized with the data source during execution of the Validating event.