asp.net - Not getting into the callback url -

I'm using oauth in my web application to access Twitter. My problem is that I can not find token secret and whenever I run my application it asks the user for authorization request. When the user clicks on "Allow", it does not return to the URL. Actually it shows a blank title page in which the URL has the Oath _ Talk value and the Oath_Verifier value. Nobody can put light on it.

Before you send users to twitter.com to authorize the app, you will receive a token Need to save a secret request. Return to the callback URL you specify. Once you need to use Request token / Incognito to obtain an access token from Twitter that will allow you to request an API as a user.