How to execute a webrequest asynchronous to parse json - vb.net

Question

I need to get a value from an API and I'm using the follow code synchronous.
Dim request As HttpWebRequest
Dim response As HttpWebResponse = Nothing
Dim reader As StreamReader
Try
request = DirectCast(WebRequest.Create("http://ecc"), HttpWebRequest)
response = DirectCast(request.GetResponse(), HttpWebResponse)
reader = New StreamReader(response.GetResponseStream())
Dim rawresp As String
rawresp = reader.ReadToEnd()
Dim jResults As JObject = JObject.Parse(rawresp)
Label1.Text = jResults("result").ToString()
Catch ex As Exception
MsgBox(ex.ToString)
Finally
If Not response Is Nothing Then response.Close()
End Try
The problem is that's synchronous, I want to make it async in order not to freeze the form in the while.
How can I async it?

Answer 1

You can easily use WebClient and the nuget package NewtonSoft doing something like this:
Imports System.IO
Imports System.Net
Imports System.Text
Imports Newtonsoft.Json
Public Class Form1
Private ReadOnly wc As New WebClient()
Private Async Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
'stop timer to avoid simultaneous I/O operations
Timer1.Stop()
Dim downloadTasks As New List(Of Task(Of String))
'download api and add as a task of string
Dim APIValue = wc.DownloadStringTaskAsync("https://api.etc")
downloadTasks.Add(Value)
Await Task.WhenAll(downloadTasks)
Dim d = JsonConvert.DeserializeObject(Of Dictionary(Of String, String))(APIValue.Result)
Dim Price As String = d("result").ToString
Label1.Text = Price
Timer1.Start()
End Sub
End Class

Answer 2

Much simpler with HttpClient and JsonNode:
'// Web API:
'// app.MapGet("/api", () => new { id = 1, result = "100", name = "name1" });
Imports System.Net.Http
Imports System.Text.Json.Nodes
Using http = New HttpClient
Dim url = "https://localhost:5000/api"
Dim json = JsonNode.Parse(Await http.GetStreamAsync(url))
Label1.Text = json("result")
End Using