c# - Decrypt message with private key RSA -

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i have problem how can find private key windows 2008 server.

first encrypt data public key extracted url https this:

 public static string encrypt(string data)     {         try         {             var crypto = new rsacryptoserviceprovider(2048);             var rsakeyinfo = crypto.exportparameters(false);             rsakeyinfo.modulus = publickeybyte();             crypto.importparameters(rsakeyinfo);              var bytesdata = encoding.unicode.getbytes(data);             var bytescyphertext = crypto.encrypt(bytesdata, false);             var cyphertext = convert.tobase64string(bytescyphertext);              return cyphertext;         }         catch (exception ex)         {              return null;         }     }     private static byte[] publickeybyte()     {         uri u = new uri("https:\\domain.com");         servicepoint sp = servicepointmanager.findservicepoint(u);          string groupname = guid.newguid().tostring();         httpwebrequest req = httpwebrequest.create(u) httpwebrequest;         req.connectiongroupname = groupname;          using (webresponse resp = req.getresponse())         {          }         sp.closeconnectiongroup(groupname);         return sp.certificate.getpublickey(); ;     }

now dont know how extract private key in c# decrypting message? , want know more informations this

thanks,

i resolved extracting certificate file .pfx , im using system.security.cryptography.x509certificates encrypting , decrypting:

public static string encrypt(string data)     {         try         {             var path = @"certificate.pfx";             var password = "test";             var collection = new x509certificate2collection();             collection.import(path, password, x509keystorageflags.persistkeyset);             var certificate = collection[0];             var publickey = certificate.publickey.key rsacryptoserviceprovider;             var bytesdata = convert.frombase64string(data);             var encrypteddata = publickey.encrypt(bytesdata, false);             var cyphertext = convert.tobase64string(encrypteddata);              return cyphertext;         }         catch (exception ex)         {              return null;         }     }     public static string decrypt(string data)     {         try         {             var path = @"certificate.pfx";             var password = "test";             var collection = new x509certificate2collection();             collection.import(path, password, x509keystorageflags.persistkeyset);             var certificate = collection[0];              var privatekey = certificate.privatekey rsacryptoserviceprovider;             var bytesdata = convert.frombase64string(data);             var databyte = privatekey.decrypt(bytesdata, false);             return convert.tobase64string(databyte);          }         catch (exception ex)         {             return "";         }     }

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