parsing JSON with vb.net

Could you please help me parse this json file. It is part of a larger Pubmed.gov file

{
  "header": {
    "type": "esummary",
    "version": "0.3"
  }
}

I have this code but is not working:

Dim Article As Header = New Header
        ' get info from JSON file
        Dim JsonString As String = File.ReadAllText("json1.JSON")
        Article = Ser.Deserialize(Of Header)(JsonString)
        TxtType.Text = Article.Type
        txtVersion.Text = Article.Version

Public Class Header
    Public Property Type As String
    Public Property Version As String
End Class

Public Class Pubmed
    Public Property Header As Header
End Class
Hector RodriguezAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
You have to use PubMed as you have the header attribute in your jSon

JSer.Deserialize(Of PubMed)(JsonString)

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Shaun VermaakTechnical Specialist/DeveloperCommented:
Using JSON.NET to an dynamic object (no need for the classes)
dynamic d = JObject.Parse(JsonString)

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Hector RodriguezAuthor Commented:
Thank you Kyle Abrahams. It is now working, only I have to understand how it works.
tjis is my final code
Thank you Again

Dim Article As Pubmed = New Pubmed
        ' get info from JSON file
        Dim JsonString As String = File.ReadAllText("json1.JSON")
        Article = Ser.Deserialize(Of Pubmed)(JsonString)

        TxtTipo.Text = Article.Header.Type
        txtVersion.Text = Article.Header.Version
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