HTML to PDF

Add this nuget package

HtmlRenderer.PdfSharp

Generate a PDF document

string htmlString = "<h1>Document</h1> <p>This is an HTML document which is converted to a pdf file.</p>";
PdfDocument pdfDocument = PdfGenerator.GeneratePdf(htmlString, PageSize.A4);

To save to disk

pdfDocument.Save("C:/temp/HTML to PDF Document.pdf");

To convert to byte array

using (MemoryStream ms = new MemoryStream())
{
    pdfDocument.Save(ms);
    byte[] byteArray = ms.ToArray();
    ....
}