Asp.Net application with DropBox not working - asp.net

Question

I set the DropBox application type Full DropBox; I set on my application the following function:
Private Const AppKey As String = "my key"
Private Const AppSecret As String = "my secret"
Private Function Upload() As String
Dim client As DropNetClient
Dim token As UserLogin
Dim userToken As String = My.Settings.userToken
Dim userSecret As String = My.Settings.userSecret
Dim needAccessToken As Boolean = (String.IsNullOrEmpty(userToken) Or String.IsNullOrEmpty(userSecret))
If (needAccessToken) Then
client = New DropNet.DropNetClient(AppKey, AppSecret)
client.UseSandbox = True
client.GetToken()
Dim url = client.BuildAuthorizeUrl()
Try
token = client.GetAccessToken()
Catch ex As Exception
Console.WriteLine("Exception! " + ex.Message)
Exit Function
End Try
userToken = token.Token
userSecret = token.Secret
My.Settings.Properties.Item("userToken").DefaultValue = userToken
My.Settings.Properties.Item("userSecret").DefaultValue = userSecret
My.Settings.Save()
Else
client = New DropNet.DropNetClient(AppKey, AppSecret, userToken, userSecret)
client.UseSandbox = True
End If
Dim rawData As Byte() = File.ReadAllBytes(Server.MapPath("") + "/Fax/" + "Fax.zip")
Dim result As MetaData = client.UploadFile("/", "fax.zip", rawData)
End Function
Unfortunately education tokens = GetAccessToken () I get the error:
Received Response [Unauthorized]: Expected to see [OK]. The HTTP response was [{" "error" ":" "Request token has not been properly authorized by a user. ""}] ".
I checked the URL (client.BuildAuthorizedUrl ()) and returns me "Unauthorized".
How can I link to Dropbox folder? I do something wrong? Or do I need to set better application of Dropbox?

Answer 1

Once you get the URL via BuildAuthorizeUrl, you need to send the user to that address and have them authorize your app. Only once they've done that can you call GetAccessToken.
The error you're seeing is because you're trying to get the access token before the user has actually authorized your app.