Check .pdf file was signed or not?

Question

Hi everyone now I have a problem I have a program using for signing pdf file. My program will get cert infor from one token(usb) then it sign in to any .pdf file. Now I want to check .pdf file was signed or not. If pdf file is signed my program exit. and if pdf file not yet sign my program keep on

Suthish Nair · Answer

PDF is not an Visual Studio product. There must be tools (third party) that supports pdf. So you need to find out those like check Our recommended articles section.

Suthish Nair · Answer

pdf signature validation + asp.net

Ta Long Van · Answer

Woooo I'm really tired with my problem! If who can help me about that I will thank so much.Beside I thank Suthish Nair you already told me about the solution. But I still find solution. Oh my god please help me!

Ta Long Van · Answer

Thanks your answer! So if I use third party tool so how my program can get the result from third party. Please tell me the detail of solution. Thanks

Suthish Nair · Answer

You need to use some third party tool please do a web search for any tools