Allowing a user to sign pdf file in asp.net

i have a pdf file and want to allow user to upload a gif file of 开发者_如何学Gotheir signature and display the signature in my pdf file...

pls follow the link http://support.persits.com/pdf/demo_fill.aspx

http://www.asppdf.com/livedemo.html -> template fill out

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You can use iTextSharp to insert an image in a PDF. See the example: iTextSharp - Working with images.