Sign file with SHA-256 Algorithm

I have a function that signing an XML file with a X509Certificate2 certificate. My problem is that the signature is inserted as SHA-1 and SHA-256 instead. What did I do wrong in my code?

CmsSigner cms = new CmsSigner(oCert);
//if apply this row receive unknow error!
//cms.DigestAlgorithm = new Oid("2.16.840."); 

ContentInfo ci = new ContentInfo(File.ReadAllBytes(cFileXml));
SignedCms cmssigned = new SignedCms(ci);
byte[] encodedmessage = cmssigned.Encode();

File.WriteAllBytes(cFile + ".p7m", encodedmessage);


I say to myself. This is the simply solution:

                string PIN = Leo.LeggiFirmacert();
            System.Security.SecureString SecurePIN = new System.Security.SecureString();
            foreach (char ch in PIN)
            { SecurePIN.AppendChar(ch); }
            var rsa = (RSACryptoServiceProvider)cert.PrivateKey;
            string ContinerName = rsa.CspKeyContainerInfo.KeyContainerName;
            string CspName = rsa.CspKeyContainerInfo.ProviderName;
            int CspType = rsa.CspKeyContainerInfo.ProviderType;
            CspParameters csp = new CspParameters(CspType, CspName, ContinerName, new System.Security.AccessControl.CryptoKeySecurity(), SecurePIN);
            SHA256Managed hashSha256 = new SHA256Managed();
            byte[] certHash = hashSha256.ComputeHash(cert.RawData);
            EssCertIDv2 essCert1 = new EssCertIDv2(new Org.BouncyCastle.Asn1.X509.AlgorithmIdentifier("2.16.840."), certHash);
            SigningCertificateV2 scv2 = new SigningCertificateV2(new EssCertIDv2[] { essCert1 });

            Org.BouncyCastle.Asn1.Cms.Attribute CertHAttribute = new Org.BouncyCastle.Asn1.Cms.Attribute(Org.BouncyCastle.Asn1.Pkcs.PkcsObjectIdentifiers.IdAASigningCertificateV2, new DerSet(scv2));
            Asn1EncodableVector v = new Asn1EncodableVector();
            Org.BouncyCastle.Asn1.Cms.AttributeTable AT = new Org.BouncyCastle.Asn1.Cms.AttributeTable(v);
            CmsSignedDataGenWithRsaCsp cms = new CmsSignedDataGenWithRsaCsp();
            Org.BouncyCastle.Crypto.AsymmetricKeyParameter keyParameter = null;
            Org.BouncyCastle.X509.X509Certificate certCopy = DotNetUtilities.FromX509Certificate(cert);
            cms.MyAddSigner(rsa, certCopy, keyParameter, "1.2.840.113549.1.1.1", "2.16.840.", AT, null);
            ArrayList certList = new ArrayList();
            Org.BouncyCastle.X509.Store.X509CollectionStoreParameters PP = new Org.BouncyCastle.X509.Store.X509CollectionStoreParameters(certList);

            Org.BouncyCastle.X509.Store.IX509Store st1 = Org.BouncyCastle.X509.Store.X509StoreFactory.Create("CERTIFICATE/COLLECTION", PP);


            FileInfo File__1 = new FileInfo(NomeFile);
            CmsProcessableFile file__2 = new CmsProcessableFile(File__1);
            CmsSignedData Firmato = cms.Generate(file__2, true);
            byte[] Encoded = Firmato.GetEncoded();
            RisFirma = "";

            return Encoded;

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