No especificas muchos datos, ni si pretendes abrir el cliente de correo predeterminado, o si lo quieres enviar usando solo código, ni con que servicio de correo POP3 o SMTP...
Ejemplo:
' GMailSender("Username@Gmail.com", "Password", "Email Subject", "Message Body", "Destiny@Address.com")
Private Function GMailSender(ByVal sername As String, ByVal Password As String, ByVal Subject As String, ByVal Body As String, ByVal DestinyAddress As String) As Boolean
Try
Dim MailSetup As New System.Net.Mail.MailMessage
MailSetup.Subject = Subject
MailSetup.To.Add(DestinyAddress)
MailSetup.From = New System.Net.Mail.MailAddress(Username)
MailSetup.Body = Body
Dim SMTP As New System.Net.Mail.SmtpClient("smtp.gmail.com")
SMTP.Port = 587
SMTP.EnableSsl = True
SMTP.Credentials = New Net.NetworkCredential(Username, Password)
SMTP.Send(MailSetup)
Return True ' Email is sent OK
Catch ex As Exception
Throw New Exception(ex.Message)
End Try
End Function
En C#:
http://converter.telerik.com/Saludos.