How I Get Data From Site Using Html Agility Pack

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Visual-Studio

HTML

VB11

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Hi guys, i want you tou ask question :) for my application i need to know how to i use htmlagilitypack so i want to get temprature data from tihs url(https://www.google.com.tr/webhp?hl=en&tab=ww&gfe_rd=cr&ei=UrWiVJGeDKuz8wf1moCQBA#hl=en&q=weather+Ankara) but the error "object reference not set to an instance of an object" Please help me for how i solve this problem

how i get data temprature data from google weather url...

This is my wrong code:

Dim webClient As New System.Net.WebClient
  Dim WebSource As String = webClient.DownloadString("https://www.google.com.tr/webhp?hl=en&tab=ww&gfe_rd=cr&ei=UrWiVJGeDKuz8wf1moCQBA#hl=en&q=weather+Ankara")

  Dim htmlDoc As New HtmlAgilityPack.HtmlDocument()
  htmlDoc.LoadHtml(WebSource)

  For Each link As HtmlNode In htmlDoc.DocumentNode.SelectNodes("//*[@id='wob_pp']")


      Label1.Text = link.InnerText
  Next