C#

public MainPage()
            {
                this.InitializeComponent();
                LoadData();
                //Setting the HTML content in the WebView control.
                MapWebView.NavigateToString(GeneratedHTML);
            }
private async void LoadData()
        {
            try
            {
                await loadJsonLocalnew("default.html", "");
            }
            catch (Exception ex)
            {

                throw;
            }
        }
public async static Task loadJsonLocalnew(string url, object ClassName)
        {
            try
            {
                //*******************************************************
                //To pick up file from local folder in window store app
                //*******************************************************
                var folder = await StorageFolder.GetFolderFromPathAsync(Windows.ApplicationModel.Package.Current.InstalledLocation.Path + @"\");
                StorageFile file = await folder.GetFileAsync(url);
                Stream stream = await file.OpenStreamForReadAsync();
                StreamReader reader = new StreamReader(stream);
                String html = reader.ReadToEnd();
                GeneratedHTML = html.ToString();//the vraible html has an error so it pass to the catch bloc

            }
            catch (Exception ex)
            {
            }}

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <WebView x:Name="MapWebView" Width="Auto" Height="700"/>
    </Grid>

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private void FillCategories(string item, TreeNode parent)
    {
        string[] category1 = item.Split(',');
        TreeNode tnParent = new TreeNode();
        tnParent.Text = category1[1];
        tnParent.Value = category1[0];
        tnParent.ToolTip = category1[1];
        tnParent.SelectAction = TreeNodeSelectAction.SelectExpand;
        tnParent.CollapseAll();
        tnParent.Selected = true;
        parent.ChildNodes.Add(tnParent);
        FillMetadata(tnParent, tnParent.Value);
    }

    private void FillMetadata(TreeNode parent, string categoryId)
    {
        DataSet ds = PDataset("SELECT MetadataID,MetadataName FROM Metadata WHERE MetadataID IN (SELECT MetadataID FROM CategoryMetadata WHERE CategoryID =" + categoryId + ") and ParentMetadataID IS NULL");
        parent.ChildNodes.Clear();
        foreach (DataRow dr1 in ds.Tables[0].Rows)
        {
            TreeNode child = new TreeNode();
            child.Text = dr1["MetadataName"].ToString().Trim();
            child.Value = dr1["MetaDataID"].ToString().Trim();
            child.ToolTip = child.Text;
            child.SelectAction = TreeNodeSelectAction.Select;
            child.CollapseAll();
            parent.ChildNodes.Add(child);
            FillSubMetadata(child, child.Value);
        }
    }

private void FillSubMetadata(TreeNode child, string metadataId)
    {
        DataSet ds = PDataset("SELECT MetadataID,MetadataName FROM Metadata WHERE ParentMetadataID =" + metadataId + " ");
        child.ChildNodes.Clear();
        foreach (DataRow dr1 in ds.Tables[0].Rows)
        {
            TreeNode subchild = new TreeNode();
            subchild.Text = dr1["MetadataName"].ToString().Trim();
            subchild.Value = dr1["MetaDataID"].ToString().Trim();
            subchild.ToolTip = subchild.Text;
            subchild.SelectAction = TreeNodeSelectAction.Select;
            subchild.CollapseAll();
            child.ChildNodes.Add(subchild);
        }
    }