Azure Asp.net download files from DropBox using Dropbox.Api - asp.net

Question

My asp.net web app requires downloading files from DropBox.
In DropBox, I created an app and have the API key and Auth Token, Secret, etc.
In my web app I have reference to Dropbox.Api and can create DropboxClient.
Like so:
Dim myDBClient As New DropboxClient("my_token_auth")
What do I do next? Does anyone have sample code.
I read I need to call async method to download such as code below.
But the code is not working. Not failing either but does nothing.
Any help would be appreciated. Thank you
Dim folder As String = "C:\Data"
Dim file2 As String = "myFile.txt"
Using response = myDBClient.Files.DownloadAsync("/" & folder & "/" & file2)
Using fileStream = File.Create("C:\Data\myFile.txt")
(response.GetContentAsStreamAsync()).CopyTo(fileStream))
End Using
End Using

Answer 1

You need to use Await to get the expected result.
Demo code:
Dim myDbClient As New DropboxClient("auth token")
Dim folder = "test" 'dropbox folder name
Dim fileName = "1.txt" 'dropbox file name
Dim response As IDownloadResponse(Of FileMetadata) = Await myDbClient.Files.DownloadAsync("/" + folder + "/" + fileName)
Dim bytes = Await response.GetContentAsByteArrayAsync()
Using fileStream = Create("D:\tom\2.txt") ' local path
fileStream.Write(bytes, 0, bytes.Length)
End Using
Update:
Add the detail test steps:
1.Create dropbox app and generate the auth token.
2.Create the folder and upload the file to dropbox folder
3.Create an Asp.net empty project and add a webform.aspx file named DropBoxApiTest.aspx and set it as start page.
4.To install Dropbox.Api, run the following command in the Package Manager Console:
PM> Install-Package Dropbox.Api
5.Add the download button in the Webpage
<asp:Button ID="_btnDownload" runat="server" Text="Download" />
6.Add the click event for the button and the following code.
Protected Async Sub _btnDownload_Click(sender As Object, e As EventArgs) Handles _btnDownload.Click
Dim token = "xaMln4bUnRAAAAAAAAAAIq...."
Dim myDbClient As New DropboxClient(token)
Dim folder = "test" 'dropbox folder name
Dim fileName = "1.txt" 'dropbox file name
Dim response As IDownloadResponse(Of FileMetadata) = Await myDbClient.Files.DownloadAsync("/" + folder + "/" + fileName)
Dim bytes = Await response.GetContentAsByteArrayAsync()
Using fileStream = Create("D:\tom\download.txt") ' local path
fileStream.Write(bytes, 0, bytes.Length)
End Using
End Sub
7.We also need to change aspx Async to true
8.Test it locally.