public static extern DWORD DsGetDcName(string computerName,
                                        string domainName,
                                        PGUID domainGuid,
                                        string siteName,
                                        DsGetDcNameFlags flags,
                                        out PDOMAIN_CONTROLLER_INFO dsInfo);
 public static extern DWORD DsGetDcName(string computerName,
                                        string domainName,
                                        PGUID domainGuid,
                                        string siteName,
                                        DsGetDcNameFlags flags,
                                        out PDOMAIN_CONTROLLER_INFO dsInfo);