public void Test()
    {
      #region request
      string data = @"<?xml version=""1.0"" encoding=""Windows-1251"" ?>
<product>
<prequest>
<req>
<AddressReq>
<street>Горького</street>
<houseNumber>1</houseNumber>
<apartment>38</apartment>
<city>Магадан</city>
<postal>685000</postal>
<addressType>1</addressType>
</AddressReq>
<AddressReq>
<street>Цветочная</street>
<houseNumber>5</houseNumber>
<apartment>143</apartment>
<city>Магадан</city>
<postal>685000</postal>
<addressType>2</addressType>
</AddressReq>
<IdReq>
<idNum>123456</idNum>
<idType>21</idType>
<seriesNumber>1234</seriesNumber>
<issueCountry>г. Магадан</issueCountry>
<issueDate>2006-03-18</issueDate>
<issueAuthority>ОВД Центральное, к/п 255</issueAuthority>
</IdReq>
<InquiryReq>
<inqPurpose>01</inqPurpose>
<inqAmount>10000</inqAmount>
<currencyCode>USD</currencyCode>
</InquiryReq>
<PersonReq>
<name1>Кустов</name1>
<first>Георгий</first>
<paternal>Георгиевич</paternal>
<gender>1</gender>
<birthDt>1946-07-06</birthDt>
<placeOfBirth>Москва</placeOfBirth>
</PersonReq>
<RequestorReq>
<MemberCode>0000TT000000</MemberCode>
<UserID>0000TT000002</UserID>
<Password>password</Password>
</RequestorReq>
<RefReq>
<product>CHST</product>
</RefReq>
<IOType>B2B</IOType>
<OutputFormat>XML</OutputFormat>
<lang>ru</lang>
</req>
</prequest>
</product>";
    #endregion

      var client = new WebClient();

      client.Credentials = new NetworkCredential("MY LOGIN", "MY PASSWORD");

      client.Headers["Content-Type"] = "text/xml; charset=windows-1251";
      client.Encoding = Encoding.GetEncoding(1251);
      
      ServicePointManager.Expect100Continue = true;
      ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

      var result = client.UploadString("https://icrs.demo.nbki.ru/score", data);
    }

public void Test()
    {
      #region request
      string data = @"<?xml version=""1.0"" encoding=""Windows-1251"" ?>
<product>
<prequest>
<req>
<AddressReq>
<street>Горького</street>
<houseNumber>1</houseNumber>
<apartment>38</apartment>
<city>Магадан</city>
<postal>685000</postal>
<addressType>1</addressType>
</AddressReq>
<AddressReq>
<street>Цветочная</street>
<houseNumber>5</houseNumber>
<apartment>143</apartment>
<city>Магадан</city>
<postal>685000</postal>
<addressType>2</addressType>
</AddressReq>
<IdReq>
<idNum>123456</idNum>
<idType>21</idType>
<seriesNumber>1234</seriesNumber>
<issueCountry>г. Магадан</issueCountry>
<issueDate>2006-03-18</issueDate>
<issueAuthority>ОВД Центральное, к/п 255</issueAuthority>
</IdReq>
<InquiryReq>
<inqPurpose>01</inqPurpose>
<inqAmount>10000</inqAmount>
<currencyCode>USD</currencyCode>
</InquiryReq>
<PersonReq>
<name1>Кустов</name1>
<first>Георгий</first>
<paternal>Георгиевич</paternal>
<gender>1</gender>
<birthDt>1946-07-06</birthDt>
<placeOfBirth>Москва</placeOfBirth>
</PersonReq>
<RequestorReq>
<MemberCode>0000TT000000</MemberCode>
<UserID>0000TT000002</UserID>
<Password>password</Password>
</RequestorReq>
<RefReq>
<product>CHST</product>
</RefReq>
<IOType>B2B</IOType>
<OutputFormat>XML</OutputFormat>
<lang>ru</lang>
</req>
</prequest>
</product>";
    #endregion

      var client = new WebClient {Credentials = new NetworkCredential("MY LOGIN", "MY PASS")};

      client.Headers["Content-Type"] = "text/xml; charset=windows-1251";
      client.Encoding = Encoding.GetEncoding(1251);
      var dataBytes = Encoding.GetEncoding(1251).GetBytes(data);

      // TODO: win 7 fix for ssl
      ServicePointManager.Expect100Continue = true;
      ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

      var a = client.UploadData("https://icrs.nbki.ru/score2", dataBytes);

      SignedCms cms = new SignedCms();
      cms.Decode(a);
      cms.CheckSignature(true);

      var content = cms.ContentInfo.Content;
    }