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Checking the EU VAT Number with an German VAT for non German VAT

TarikHuber

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1 Dec 2014

Easy library for checking VAT Numbers of European Companies. Only usable with an German VAT for non German VAT!!!

Introduction

This library and demo project are only usable for German users with a German VAT!!!

The "Bundeszentralamt für Steuern" has made an interface to check VAT Numbers from other countries. More information can be found here.

The Code

The main method is just a call of the XML RPC API over an HTML link:

        [XmlRpcUrl("https://evatr.bff-online.de/")]
        public interface ISumAndDiff : IXmlRpcProxy
        {
            [XmlRpcMethod("evatrRPC")]
            string testMyClient(string UstId_1, string UstId_2,
            string Firmenname, string Ort, string PLZ, string Strasse, string Druck);
        }

 public int Response(string UstId_1, string UstId_2,
            string Firmenname, string Ort, string PLZ, string Strasse, bool Druck)
        {
            _Message = string.Empty;
            _Erg_Name = string.Empty;
            _Erg_Ort = string.Empty;
            _Erg_PLZ = string.Empty;
            _Erg_Str = string.Empty;
            _Druck = string.Empty;

            int errorCode = 0;

            ISumAndDiff proxy = XmlRpcProxyGen.Create<ISumAndDiff>();

            string ret = proxy.testMyClient(UstId_1, UstId_2, Firmenname, 
            Ort, PLZ, Strasse, Druck ? "ja" : "nein");        

            var xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(ret);

            XmlNodeList elemList = xmlDoc.GetElementsByTagName("string");

            int.TryParse(elemList[3].InnerXml.ToString(), out errorCode);

            DateTime.TryParse(elemList[23].InnerXml.ToString(), out GueltigAb);
            DateTime.TryParse(elemList[25].InnerXml.ToString(), out GueltigBis);

            _Erg_Name =elemList[21].InnerText;
            _Erg_Ort = elemList[17].InnerText;
            _Erg_PLZ = elemList[9].InnerText;
            _Erg_Str = elemList[31].InnerText;
            _Druck = elemList[7].InnerText;

            if (ErrorCodes.Keys.Contains(errorCode))
            {
                _Message = String.Format(ErrorCodes[errorCode], 
                GueltigAb.ToShortDateString(), GueltigBis.ToShortDateString());
            }
            else
            {
                _Message = string.Empty;
            }

            return errorCode;
        }

Using the Code

To use the code, the DLL has to be added to the project.

The only thing needed to check a UID Number is to call the "Code" method. It gives as result the ErrorCode of the API (the code 200 means that the UID is OK) and a message that explains the ErrorCode.

int code = 0;

                UID.Check check = new Check();

                code = check.Response
                (UstId_1, UstId_2, Firmenname, Ort, PLZ, Strasse, chkQualified.Checked);

                lblErg_Fname.Text =check.ParameterMessage(check.Erg_Name);
                lblErg_Ort.Text = check.ParameterMessage(check.Erg_Ort);
                lblErg_PLZ.Text = check.ParameterMessage(check.Erg_PLZ);
                lblErg_Str.Text = check.ParameterMessage(check.Erg_Str);

txtResult.Text = check.Message;

You can find all ErrorCodes here. (01.12.2014)

History

04.12.2014 - Detailed Parameter Results Added
12.12.2014 - Using the "CookComputing.XmlRpc" Library, the Response recognizes all Company Names

License

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