Importing Customers, Vendors and Products in AX 2012

This calls the vendor service:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using ConsoleApplication9.Vendors;

namespace ConsoleApplication9

{

    class Program

    {

        static void Main(string[] args)

        {

            VendTableServiceClient proxy = new VendTableServiceClient();

            CallContext context = new CallContext();

          
context.Company = "ceu";  //New class that replaces AX endpoints.  It makes it obvious which company you are importing data into.  I love this class!! 

            AxdVendTable vendor = new AxdVendTable();

             AxdEntity_VendTable[] vendTables = new AxdEntity_VendTable[1];

            AxdEntity_VendTable vendTable = new AxdEntity_VendTable();

            //vendTable.AccountNum = "877778";  //If your number sequences for vendor accounts are set to manual set this property          
vendTable.Currency = "USD";          
vendTable.VendGroup = "10";

          
vendTable.Name = "My Vendor Test Name";

            //Create the party record

            AxdEntity_DirPartyTable_DirPerson party = new AxdEntity_DirPartyTable_DirPerson();

party.NameAlias = "First2";

            //Set the name fields

            AxdEntity_PersonName personName = new AxdEntity_PersonName();

personName.FirstName = "First2";

personName.MiddleName = "Middle2";

personName.LastName = "Last2";

            //Add the names to the party record and set the name sequence

party.PersonName = new AxdEntity_PersonName[1] { personName };

party.NameSequence = "FirstLast";          
vendTable.DirPartyTable = new AxdEntity_DirPartyTable_DirPartyTable[1] { party };

            vendTables[0] = vendTable;

vendor.VendTable = vendTables;

proxy.create(context, vendor);

        }

    }

}

This one is for customers:

            CustomerServiceClient proxy = new CustomerServiceClient();
            CallContext context = new CallContext();
            context.Company = "ceu";

            AxdCustomer customer = new AxdCustomer();

            AxdEntity_CustTable custTable = new AxdEntity_CustTable();
            custTable.AccountNum = "998877";
            custTable.Currency = "USD";
            custTable.CustGroup = "20";
            custTable.OneTimeCustomer = AxdExtType_OneTimeCustomer.Yes;
            custTable.OneTimeCustomerSpecified = true;

            //Create the party record
            AxdEntity_DirParty_DirPerson party = new AxdEntity_DirParty_DirPerson();
            party.NameAlias = "Becky";

            //Set the name fields
            AxdEntity_PersonName personName = new AxdEntity_PersonName();
            personName.FirstName = "Becky";
            personName.MiddleName = "ILiveForThis";
            personName.LastName = "Newell";

            //Add the names to the party record and set the name sequence
            party.PersonName = new AxdEntity_PersonName[1] { personName };
            party.NameSequence = "FirstLast";

            //Create a postal address
            AxdEntity_DirPartyPostalAddressView address = new AxdEntity_DirPartyPostalAddressView();
            address.LocationName = "Location Name";
            address.Street = "2122 NE 5th St";
            address.City = "Beverly Hills";
            address.State = "CA";
            address.CountryRegionId = "USA";
            address.ZipCode = "90210";
            address.Roles = "Home;Delivery";

            //Create an electronic address
            AxdEntity_DirPartyContactInfoView electronicAddress = new AxdEntity_DirPartyContactInfoView();
            electronicAddress.LocationName = "Contact Email";
            electronicAddress.Type = AxdEnum_LogisticsElectronicAddressMethodType.Email;
            electronicAddress.TypeSpecified = true;
            electronicAddress.Locator = "beckynewell@madeup.com";
            electronicAddress.Roles = "Home";

            //Add the addresses to the party record and the party to the CustTable record
            custTable.DirParty = new AxdEntity_DirParty_DirPartyTable[1] { party };
            custTable.DirParty[0].DirPartyPostalAddressView = new AxdEntity_DirPartyPostalAddressView[1] { address };
            custTable.DirParty[0].DirPartyContactInfoView = new AxdEntity_DirPartyContactInfoView[1] { electronicAddress };

            //Add the CustTable record to the Customer entity
            customer.CustTable = new AxdEntity_CustTable[1] { custTable };

            //Create the customer
            proxy.create(context, customer);

For items you want to go out to this blog which shows you how to import items -http://blogs.msdn.com/b/dynamicsaxscm/archive/2011/07/06/product-item-data-management-services.aspx