access Google spreadsheet with oAuth2

I am trying to get a solution that I can have a process that signs into a Google spreadsheet and grabs some values without using regular Google username/passsword and instead use oAuth2. The below seems like it works but I have to do a manual step of taking the url in sAuthURL and manually enter into a browser and click 'Allow access' button and then it redirects to a url like so:
.../googlespreadsheettest.aspx?code=4/O*****************************************

Is it possible to do without the manual step?

Thanks.

Code:

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Imports Google.GData.Spreadsheets
Imports Google.Spreadsheets
Imports Google.GData.Client
...
Protected Sub form1_Load(sender As Object, e As System.EventArgs) Handles form1.Load
        'OBJECTIVE: Log into a Google spreadsheet and grab a worksheets data using OAuth2
        'BELOW FROM: https://developers.google.com/google-apps/spreadsheets/

        'OAuth 2.0 info
        Dim sCLIENT_ID = "###########.apps.googleusercontent.com"
        Dim sCLIENT_SECRET = "E******************G"
        Dim sSCOPE = "https://spreadsheets.google.com/feeds https://docs.google.com/feeds"
        Dim sREDIRECT_URI = "http://www.domain.com/googlespreadsheettest.aspx"

        'OAuth Object
        Dim oaParams As OAuth2Parameters = New OAuth2Parameters
        oaParams.ClientId = sCLIENT_ID
        oaParams.ClientSecret = sCLIENT_SECRET
        oaParams.RedirectUri = sREDIRECT_URI

        'Get authorized url
        oaParams.Scope = sSCOPE
        Dim sAuthURL as String = OAuthUtil.CreateOAuth2AuthorizationUrl(oaParams)

        'Response.Write(sAuthURL)
        'Response.Write("<br/> Please visit the URL above to authorize your oauth request token.")

        'Auto post sAuthURL to get token
        Dim wp As WebPost = New WebPost
        wp.URL = sAuthURL
        Dim sRetHtml As String = wp.Request(String.Empty, True)
        Response.Write("<br />" & sRetHtml)
        ''sRetHtml is returning a page to sign into google.  If I output sAuthURL and take it and manually enter into browser and allow access it seems to work.

        'oaParams.AccessCode = ""

        ''Get Access Token
        'OAuthUtil.GetAccessToken(oaParams)
        'Dim sToken As String = oaParams.AccessToken
        'Response.Write("OAuth Access Token: " & sToken)

        ''make oauth request
        'Dim requestFactory As GOAuth2RequestFactory = New GOAuth2RequestFactory(vbNull, "MyAppNameHere", oaParams)
        'Dim service As SpreadsheetsService = New SpreadsheetsService("MyAppNameHere")
        'service.RequestFactory = requestFactory

 
    End Sub

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