El Bruno

Public Function IsEmailValid(ByVal sEmail As String) As Boolean

    Dim sEmailRegex 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 oRegex As System.Text.RegularExpressions.Regex = New System.Text.RegularExpressions.Regex(sEmailRegex)

    If Not (oRegex.IsMatch(sEmail)) Then

    Return False

    Else

    Return True

    End If

End Function

public bool IsEmailValid(string sEmail)

{

 string sEmailRegex = "^([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})(\\]?)$";

 System.Text.RegularExpressions.Regex oRegex = new System.Text.RegularExpressions.Regex(sEmailRegex);

 if (!((oRegex.IsMatch(sEmail)))) {

   return false;

 } else {

   return true;

 }

}