Pop3Client not working for yahoo

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ASP.NET

I am trying to retrieve mails from Yahoo account using vb.net. I have used openpopup (Pop3) to do that. Here is my code

Using client As New Pop3Client()
               If client.Connected Then client.Disconnect()
               clientConnect("pop.mail.yahoo.com", 995, true)
               client.Authenticate("Yahoo UserName", "Yahoo Password",AuthenticationMethod.UsernameAndPassword)
               client.Disconnect()
               Return True
         End Using

I am stuck up with the follwoing problem "The server did not accept user credentials while authenticating it, but I am sure that the credentials are correct (I can connect the server with this credentials)

I tried the same code with my gmail, hotmail and aol accounts. It works fine but not for Yahoo. When i try to authenticate with yahoo credentials, I got the following error.
"Server did not accept user credentials". Please give me the solution for this