The keyset is not defined [duplicate]

Question

I'm building an application (win form) by C# .NET for document signing. I have got an error in signing. When I sign document on some computers (windows 7, windows 10, not in Windows Server), I got an error: "The keyset not defined". So, Someone can tutorial or suggest me how can fix this problem? Thank so much! This is my code: // get certficate public X509Certificate2 LoadCertificateFromWindowsStore() { X509Store x509Store = new X509Store(StoreName.My, StoreLocation.CurrentUser); try { x509Store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); X509Certificate2Collection numberCerts = (X509Certificate2Collection)x509Store.Certificates; X509Certificate2Enumerator certEnumerator; if (numberCerts.Count == 1) { certEnumerator = numberCerts.GetEnumerator(); while (certEnumerator.MoveNext()) return certEnumerator.Current; return null; } else if (numberCerts.Count > 1) { X509Certificate2Collection chooseCert = X509Certificate2UI.SelectFromCollection(numberCerts, "Certificates List", "Choose your certificate", X509SelectionFlag.SingleSelection);
if (chooseCert.Count == 1) return chooseCert[0]; else return null; } else return null; } catch (CryptographicException e) { Console.WriteLine(e.Message); } finally { x509Store.Close(); } return null; }
// using the cert to sign var cert = LoadCertificateFromWindowsStore(); if (cert.HasPrivateKey) // WORKS!!! {
signedXml.SigningKey = cert.PrivateKey; // THROW "keyset does not exist" EXCEPTION ...

Answer 1

I have solved this error. It is very easy. You select the "Platform target" to x86.

Right click on your project -> Properties -> Build -> Platform target -> x86

Regards,