如何使用C#连接到Clusterpoint数据库

我已经下载了API文件。我不知道如何执行到Clusterpoint数据库的连接。当我运行此代码时，我会收到一条消息"连接字符串错误"。这也将有助于提供一个完整的crud示例的参考。Thx。

string _url = @"https://api-eu.clusterpoint.com/v4";        //eu is correct
string _dbName = "db1";
string _username = "a@hotmail.com";                //not real
string _password = "...";                          //not real
string _document = "document";
string _documentID = "//document/id";
Dictionary<string, string> 
_dic = new Dictionary<string, string>(){ { "account", "0000" } };  //0000 not real
try
{
    CPS_Connection cpsConnection = new CPS_Connection(_url, _dbName, _username, _password, 
                                                      _document, _documentID, _dic);
    /* CPS_Connection cpsConnection = new CPS_Connection(
        "tcp://SERVER_IP:SERVER_PORT", "example", "username",        
        "password", "document",
        "/document/id", new Dictionary<string, string>() 
        { { "account", "<YOUR_ACCOUNT_ID>" } });
    */
}
catch (Exception e)
{
    Console.WriteLine("Connection Error...."+e.Message);
    Console.Read();
    return;
}