[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool CryptGetKeyParam(
IntPtr hProv,
uint dwParam,
[Out] byte[] pbData,
[In, Out] ref uint pdwDataLen,
uint dwFlags);

public static void GetCertFromContainer()
{
uint BUFFSIZE = 512;
ArrayList containernames = new ArrayList();
byte[] pcbData= { };
//String provider = null; //can use null, for default provider
String provider = "Crypto-Pro GOST R 34.10-2001 Cryptographic Service Provider";
String container = null; //required for crypt_verifycontext
uint type = PROV_RSA_FULL;
uint cspflags = CRYPT_VERIFYCONTEXT | CSPKEYTYPE; //no private key access required.
IntPtr hProv = IntPtr.Zero;

bool gotcsp = Win32.CryptAcquireContext(ref hProv, container, provider, type, cspflags);
Win32.CryptGetKeyParam( hProv, KP_CERTIFICATE, pcbData,ref BUFFSIZE, 0);


}