Hi Charulatha,
At present, we do not have PdfViewer control in ASP.NET. But
we can view the pdf document as images in ASP.NET by using ExportAsImage
available with PdfViewer.Windows.
Attached a simple sample on this.
Attachment: http://www.syncfusion.com/downloads/support/directtrac/general/PdfViewerWeb1195123604.zip
Regarding the encryption of pdf document, it is not possible
to encrypt a pdf document with PdfViewer, but can be done by using our Pdf library.
Please find the online sample in the below link.
http://asp.syncfusion.com/demos/web/Pdf/EncryptionSupport.aspx
Please, let us know if you need any further assistance.
Thanks,
Uthistran S.