email validation in windows application [modified]

[praveenkumar palla]

Hi all how to accomplish email validation in windows application Thanks in advance PraveenKumar Palla -- modified at 9:39 Friday 22nd June, 2007

[Sathesh Sakthivel]

Email Validation[^]

Regards, Satips.:rose:

[praveenkumar palla]

Really i am verry sorry i need email validation in windows application

[Vasudevan Deepak Kumar]

You can have a syntax level regex validation. I have reviewed about fValidate here: http://lavanyadeepak.blogspot.com/2006/06/fvalidate-full-fledged-form-validation.html[^] Also, you can check out http://www.hexillion.com/[^] I also have a brief article on using regular expressions here: http://www.dotnetspider.com/kb/Article3033.aspx[^]

Vasudevan Deepak Kumar Personal Homepage Tech Gossips

[Dave Kreskowiak]

The email address format validation is normally done by a regular expression. The link he posted was kind of accurate, but since it's a C++ article, it may be difficult to understand. This code was taken from this article[^] and converted to VB.NET.

Imports System.Text.RegularExpressions
.
.
.
Public Shared Function EmailAddressIsValid(ByVal address As String) As Boolean
Dim strRegex As String = "^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" & _
"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" & _
".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"
Dim re As New Regex(strRegex)
If re.IsMatch(address)
Return True
Else
Return False
End Function

A guide to posting questions on CodeProject[^]
Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
     2006, 2007

[ctwalker]

Try something like the following: Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim objRegEx As New System.Text.RegularExpressions.Regex("^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$") If objRegEx.IsMatch(TextBox1.Text) Then ErrorProvider1.SetError(sender, "") Else ErrorProvider1.SetError(sender, "Email address is not valid") End If End Sub You may have to adjust the regex depending on what you consider a valid email address.