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Before you can use the following codes, please download EASend Mail SMTP Component and install it on your machine at first.Full sample proejcts are included in this installer.Example 3 shows how to do so through the static Validate Property method of the Validator class.Me._first Name Then Dim validation Context As New Validation Context(Me, Nothing, Nothing) validation Context. Validate Property(value, validation Context) Me._first Name = value Me.Moreover, to prevent email address testing, many email providers accept the recipient address at first no matter if the address is valid or invalid, only after you sent the email data to the server, then the server rejects it if the recipient address is invalid. If you don’t get Transport Error and Failure Report in 24 hours, that means the recipient is valid.If you get Failure Report, you should consider to remove this recipient from your mail listing.

Substring(i * 2, 1)) Next Dim b As Integer = 0 For i As Integer = 0 To 5 b = b * 10 CInt(ID.Validation is performed on any occasion when changes are committed - navigation, insertion of new items or when Auto Commit is set to True, for example.This feature is available for both auto-generated and customized fields and all of the System. Data Annotations validation attributes are supported. In order to enable this kind of validation you first need to include the System. Data Annotations namespace: Figure 1 shows Rad Data Form's state after validation has been performed.The following example codes demonstrate how to test email address without specified SMTP server.Validate Email Address Syntax Regular expression can be used to validate if an email address is in correct format.

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