Hi all,

The following C# sample shows a dialog to view a certificateand its properties. This is the same dialog that appears when we double-click on the cert file in Explorer. I'll use CryptUIDlgViewCertificate API and its CRYPTUI_VIEWCERTIFICATE_STRUCT structure to achieve this:

...

using System.Security.Cryptography.X509Certificates;

using System.Runtime.InteropServices;

namespace MyNamespace

{

    public partial class MyClass

    {

...

        public const int CRYPTUI_DISABLE_ADDTOSTORE = 0x00000010;
        [DllImport("CryptUI.dll", CharSet = CharSet.Auto, SetLastError = true)]

        public static extern Boolean CryptUIDlgViewCertificate(

            ref CRYPTUI_VIEWCERTIFICATE_STRUCT pCertViewInfo,

            ref bool pfPropertiesChanged

        );
        public struct CRYPTUI_VIEWCERTIFICATE_STRUCT

        {

            public int dwSize;

            public IntPtr hwndParent;

            public int dwFlags;

            [MarshalAs(UnmanagedType.LPWStr)]

            public String szTitle;

            public IntPtr pCertContext;

            public IntPtr rgszPurposes;

            public int cPurposes;

            public IntPtr pCryptProviderData; // or hWVTStateData

            public Boolean fpCryptProviderDataTrustedUsage;

            public int idxSigner;

            public int idxCert;

            public Boolean fCounterSigner;

            public int idxCounterSigner;

            public int cStores;

            public IntPtr rghStores;

            public int cPropSheetPages;

            public IntPtr rgPropSheetPages;

            public int nStartPage;

        }
        private void MySampleFunction()

        {

            // Get the cert

            X509Certificate2 cert = new X509Certificate2(@"C:\temp\mycert.cer");
            // Show the cert

            CRYPTUI_VIEWCERTIFICATE_STRUCT certViewInfo = new CRYPTUI_VIEWCERTIFICATE_STRUCT();

            certViewInfo.dwSize = Marshal.SizeOf(certViewInfo);

            certViewInfo.pCertContext = cert.Handle;

            certViewInfo.szTitle = "Certificate Info";

            certViewInfo.dwFlags = CRYPTUI_DISABLE_ADDTOSTORE;

            certViewInfo.nStartPage = 0;

            bool fPropertiesChanged = false;

            if (!CryptUIDlgViewCertificate(ref certViewInfo, ref fPropertiesChanged))

            {

                int error = Marshal.GetLastWin32Error();

                MessageBox.Show(error.ToString());

            }

        }

    }

}

I hope this helps.

Regards,

Alex (Alejandro Campos Magencio)