## ThumbnailGeneratingOptions.GenerateFromFirstPage property

Specifies whether to generate thumbnail from first page of the document or first image.

```csharp
public bool GenerateFromFirstPage { get; set; }
```

## Remarks

Default is `true`, which means thumbnail will be generated from first page of the document. If value is `false` and there is no image in the document, thumbnail will be generated from first page of the document.

## Examples

Shows how to update a document's thumbnail.

```csharp
Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

builder.Writeln("Hello world!");
builder.InsertImage(ImageDir + "Logo.jpg");

// There are two ways of setting a thumbnail image when saving a document to .epub.
// 1 -  Use the document's first page:
doc.UpdateThumbnail();
doc.Save(ArtifactsDir + "Document.UpdateThumbnail.FirstPage.epub");

// 2 -  Use the first image found in the document:
ThumbnailGeneratingOptions options = new ThumbnailGeneratingOptions();
options.ThumbnailSize = new Size(400, 400);
options.GenerateFromFirstPage = false;

doc.UpdateThumbnail(options);
doc.Save(ArtifactsDir + "Document.UpdateThumbnail.FirstImage.epub");
```

### See Also

* class [ThumbnailGeneratingOptions](../)
* namespace [Aspose.Words.Rendering](../../../aspose.words.rendering/)
* assembly [Aspose.Words](../../../)