WordPress posting problem

Hi,

I'm having a problem with posting to a selected category on WP. The posting works fine with this code , which i found on the net, the problem is that it posts only to the default category, it wont post on other categories even when i select the blog id.... any ideas?

Code:

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    Public Structure category
        Public categoryId As Object
        Public parentId As Object
        Public description As Object
        Public categoryName As Object
        Public htmlUrl As Object
        Public rssUrl As Object
    End Structure
    <XmlRpcUrl("http://mysite.org/xmlrpc.php")> _
    Public Interface IWP
        Inherits IXmlRpcProxy

        <XmlRpcMethod("wp.getCategories")> _
        Function getCategories(ByVal args() As String) As category()
    End Interface
    Public Structure blogInfo
        Public title As String
        Public description As String
    End Structure

    Public Interface IgetCatList
        <CookComputing.XmlRpc.XmlRpcMethod("metaWeblog.newPost")> _
        Function NewPage(ByVal blogId As Integer, ByVal strUserName As String, ByVal strPassword As String, ByVal content As blogInfo, ByVal publish As Integer) As String
    End Interface

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Button code

Code:

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Dim newBlogPost As blogInfo = Nothing
        newBlogPost.title = "Test"
        newBlogPost.description = "Test"
        Dim categories = CType(XmlRpcProxyGen.Create(GetType(IgetCatList)), IgetCatList)
        Dim clientProtocol = CType(categories, XmlRpcClientProtocol)
        clientProtocol.Url = WPsite & "/xmlrpc.php"
        Dim result As String = Nothing
        result = ""

        Try
            result = categories.NewPage(2, WPuser, WPpass, newBlogPost, 1)
            'MessageBox.Show("Posted to Blog successfullly! Post ID : " & result)
            ' ListView1.Items(0).SubItems(1).Text = "Posted to WP..."
        Catch ex As Exception
            ''ListView1.Items(0).SubItems(1).Text = "Error posting to WP..."
            ' MessageBox.Show(ex.Message)
        End Try

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references :

Code:

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http://stackoverflow.com/questions/3519228/using-vb-net-application-to-post-on-wordpress-blog
http://www.dotnetcurry.com/ShowArticle.aspx?ID=419

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anyone? :/