(Urgenttt) Digitally Signing sharepoint Forms using Managed Code in C# _ Signature not valid

Hi,
I have probleme with sharepoint project in vs 2010. I try to sign an infopath form from my sharepoint project (with c#) but when opening my signed form I've got a message box that says : "one or more digitall signature can't be verifiyed in this
form, to modify your document delete existant signature". We are using "Working with signed Infopath forms in Biztalk" to create and verify the signature. It work fine with a asp.net application and the resulting infopath signature are
valid. infopath do recognize this signature and they are valid. But when we implement the same methode in sharepoint project and sign the same infopath form the resulting signature are not valid.
Thanks

Hi,
I have changed the .net framework of my asp.net application from 4.0 to 3.5 ansd I got the same problem that I have with my sharepoint project .
So the problem is in the version of .net framework but the problem is that I can't change the framework to 4.0 ,Sharepoint project doesn't support this framework
any solutions please,

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(Urgenttt) Digitally Signing sharepoint Forms using Managed Code in C# _ Signature not valid

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