How to add text on thumbnails in WPF thumbnail viewer?

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Here is C#/VB.NET code that shows how to add caption for thumbnails in WPF UI-control WpfThumbnailViewer:

Vintasoft.Imaging.Wpf.UI.ThumbnailImageItemCaption caption = thumbnailViewer1.ThumbnailCaption;

caption.IsVisible = true;
caption.CaptionFormat = "{PageNumber} page";
caption.Anchor = Vintasoft.Imaging.AnchorType.Bottom;
caption.TextColor = System.Windows.Media.Colors.Blue;
caption.FontFamily = System.Windows.SystemFonts.CaptionFontFamily;
caption.FontSize = 18;

VB.NET

Dim caption As Vintasoft.Imaging.Wpf.UI.ThumbnailImageItemCaption = thumbnailViewer1.ThumbnailCaption

caption.IsVisible = True
caption.CaptionFormat = "{PageNumber} page"
caption.Anchor = Vintasoft.Imaging.AnchorType.Bottom
caption.TextColor = System.Windows.Media.Colors.Blue
caption.FontFamily = System.Windows.SystemFonts.CaptionFontFamily
caption.FontSize = 18

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