How To Get Same Source Code As WebBrowser Using HttpWebRequest

I am trying to get the source code from a webpage. The WebBrowser control is giving me the information that I am looking for. However, I want to use HttpWebRequest, but its giving me different source code than the WebBrowser DocumentText. How can I get the same source code as WebBrowser using HttpWebRequest?

WebBrowser Code:
WebBrowser1.Navigate("[URL]" & txtUrl.Text)
textbox1.Text = WebBrowser1.DocumentText
WebBrowser Result: [URL]

HttpWebRequest Code:
Dim request As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create(url)
request.KeepAlive = False
request.Timeout = 10000
Dim response As System.Net.HttpWebResponse = request.GetResponse()
Dim sr As System.IO.StreamReader = New System.IO.StreamReader(response.GetResponseStream())
Dim sourcecode As String = sr.ReadToEnd()

HttpWebRequest Result: [URL]