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protected async void Page_Load(object sender, EventArgs e)
{
    test++;
    if (!Page.IsPostBack)
    {
        if (Request.Form["method"] == "Test")
        {
            MyType[] obj = await Test(Request.Form["msg1"], Request.Form["msg2"]);
            string json = new JavaScriptSerializer().Serialize(obj);
            Response.Write(json);

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open System

type Eff<'Ctx, 'T> = 'Ctx -> 'T

type EffBuilder() =
	member __.Return x : Eff<'Ctx,'T> = 
		fun _ -> x 
	member __.Bind(f : Eff<'Ctx, 'T>, g : 'T -> Eff<'Ctx, 'S>) : Eff<'Ctx, 'S> = 
		fun c -> g (f c) c 
	member __.Zero() : Eff<'Ctx, unit> = 

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let rec bfs2robust (fanout: Map<'node, 'node seq> -> 'node -> 'node seq) (tree: Map<'node, 'node seq>) (node: 'node) : 'node seq = 
    let single = seq [node]
    match fanout tree node with
    | e when e = Seq.empty -> single
    | s -> Seq.fold (fun acc item -> 
        bfs2robust fanout (tree |> Map.remove node) item 
        |> Seq.append acc) single s |> Seq.distinct

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let rec bfs2 (fanout: Map<'node, 'node seq> -> 'node -> 'node seq) (tree: Map<'node, 'node seq>) (node: 'node) : 'node seq = 
    let single = seq [node]
    match fanout tree node with
    | e when e = Seq.empty -> single
    | s -> Seq.fold (fun acc item -> 
        bfs2 fanout tree item 
        |> Seq.append acc) single s

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public class BindableTextBlock : TextBlock
{
    public ObservableCollection<Inline> InlineList
    {
        get { return (ObservableCollection<Inline>)GetValue(InlineListProperty); }
        set { SetValue(InlineListProperty, value); }
    }
    
    public static readonly DependencyProperty InlineListProperty =
        DependencyProperty.Register("InlineList", typeof(ObservableCollection<Inline>), typeof(BindableTextBlock), new UIPropertyMetadata(null, OnPropertyChanged));

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            <DataGrid Grid.Column="2" ItemsSource="{Binding SelPayment.eur_invoices}" IsReadOnly="True" AutoGenerateColumns="False"
                HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,10,10,10" >
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Buy/Sell" Binding="{Binding buysell}" />
                    <DataGridTextColumn Header="Cpty Name" Binding="{Binding CptyName}" />
                    <DataGridTextColumn Header="Invoice Nr" Binding="{Binding InvoiceNr}" />
                    <DataGridTextColumn Header="Amount" Binding="{Binding amount, StringFormat=N}" />
                    <DataGridTextColumn Header="Curr" Binding="{Binding curr}" />
                    <DataGridTextColumn Header="Msg" Binding="{Binding ui.msg}" />
                </DataGrid.Columns>

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type Back2UI() = 
    inherit SimpleViewModelBase() 
    let mutable _msg = ""
    member this.msg
        with get() = _msg
        and set value =
            _msg <- value
            this.OnPropertyChanged(<@ this.msg @>)

type ActivePassive = Active | Passive

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<DataGrid Grid.Column="2" ItemsSource="{Binding SelPayment.eur_invoices}" IsReadOnly="True"
                HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,10,10,10" >

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// business model
type Invoice = { CptyName: string; CptyNum: int; InvoiceNr: string; amount : decimal; curr: string; buysell: ActivePassive}

// array extraction from Excel with type provider
let ActiveInvoice = 
    ActiveInvoiceExcel.Data
    |> Seq.map ( fun line -> { InvoiceNr = line.``Numero documento``; ... })
    |> Seq.toArray

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type DifferenceType<'TKey, 'T> =
    | Added of 'TKey * 'T
    | Removed of 'TKey * 'T
    | Modified of 'TKey * 'T * 'T * seq<string * (string * string)> with
    member this.Key =
        match this with
        | Added (key, _)
        | Removed (key, _)
        | Modified (key, _, _, _) -> key