I will get back to you soon.

Refer below link.

Convert pdf file to image file in c#.net

HELLO SIR

I got code but not able to found a related library to build.

I need to convert multiple-page pdf to jpeg and save.

code: 

public static void SavePageToImageDemo()
        {
            string fileName = FolderName + "Sample.pdf";

            REDocument doc = REFile.OpenDocumentFile(fileName, new PDFDecoder());//use PDFDecoder open a pdf file

            int pageCount = doc.GetPageCount();//get pdf's page count

            for (int pgIdx = 0; pgIdx < pageCount; pgIdx++)
            {
                BasePage aPage = doc.GetPage(pgIdx);//get page from REDocument

                try
                {
                    REImage img = (REImage)aPage.ToImage();//translate page to image
                    REFile.SaveImageFile(img, FolderName + "output" + pgIdx + ".bmp");//save image
                }
                catch (Exception)
                {
                    Debug.WriteLine("Fail to display page " + pgIdx);
                }
            }
        }

Refer below links.

https://sautinsoft.com/products/pdf-focus/examples/convert-pdf-to-jpg-with-high-quality-csharp-vb-net.php

https://docs.aspose.com/pdf/net/convert-pdf-pages/

not able to find the dll of SautinSoft

SautinSoft.PdfFocus f = new SautinSoft.PdfFocus();