Question : How To Read The Gmail Inbox using SMTP

I am Devloping an application in which I need to read the Mails form gmail Inbox of the client. I want To achieve the foolwing Points.

I don't want to use any Third Party Dll like (ASPosse or chilkat).
I want to use SMTP Preafably. or IMAP will do I don't want to use POP3

I am aware about reading unread mails from gmail Feeds Which I don't Want to use Due to These Problems:
   Only unread mails can be read and that to max upto 20 mails.
   the mail body is not included into the feed only summary is included.

In pop3 The problem is that it always stars to read from the First Mail Which I don't Want. I want to strart form the mail where I have Left.

I would Like use C# with ASP.NET to develope my code

I want to devlope code. not to use 3rd party dll

Answer : How To Read The Gmail Inbox using SMTP

I found the answer by myself using pop3 still if there are any experts who can through some light onn the qusetion using IMAP are welcomed