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Gets or sets the encoding used when exporting to HTML.
If no encoding has been set, the default value is UTF-8.
public Encoding Encoding { get; set; }
Public Property Encoding As Encoding
HtmlSaveOptions options = new HtmlSaveOptions();
options.Encoding = Encoding.Unicode;
Encoding encoding = options.Encoding;
using MemoryStream stream = new MemoryStream();
workbook.Save(stream, options);