C# error(using interface methods): An object reference is required for the non-static field, method, or property

I'm having trouble using a third party API that has outdated docume开发者_运维技巧ntation, so I'm trying to figure out why this piece of @#$! isn't working. And by @#$! i mean "code", of course :)

So as far as i know WAPISoap is a public interface that I have obtained by adding a web reference in visual studio.

I also know the Describe() method accepts two parameters, a string and an object of type credential and it returns a string. Any help would be greatly appreciated :)

Here's what i got so far:

using WAPIClient;
using System;
using Project1.WsWWDAPI;
namespace WAPIClient
{
    class ResellerAPI
    {
        public void CallDescribe()
        {
            String sReturnXml;
            Credential m_Crededential = new Project1.WsWWDAPI.Credential();
            m_Crededential.Account = "account";
            m_Crededential.Password = "password";
            String sCLTRID = System.Guid.NewGuid().ToString();
            sReturnXml = WAPISoap.Describe(sCLTRID, m_Crededential);
            Console.WriteLine(sReturnXml);
        }
        static void Main(string[] args)
        {
            ResellerAPI reseller = new ResellerAPI();
            reseller.CallDescribe();
        }
    }
}

The Describe method is not static, which means you need to call it on an instance of the WAPI class:

WsWWDAPI.WAPI m_WAPIObj = null;
WsWWDAPI.Credential m_Crededential = null;

public void Init()
{
    m_WAPIObj = new WsWWDAPI.WAPI();
    m_Crededential = new WsWWDAPI.Credential();
    m_Crededential.Account  = "account";
    m_Crededential.Password = "password";
}
public void CallDescribe()
{
    String sReturnXml;
    String sCLTRID = System.Guid.NewGuid().ToString();
    sReturnXml = m_WAPIObj.Describe(sCLTRID, m_Crededential);
    Console.WriteLine( sReturnXml );
}
static void Main(string[] args)
{
    ResellerAPI reseller = new ResellerAPI();
    reseller.Init();
    reseller.CallDescribe();
}

See: http://products.secureserver.net/guides/wsapiquickstart.pdf

The error is because you use non-static method in static context - you should have instance of the WAPISoap in order to call member function which is not static

It sounds like you need to create an instance of WAPISoap and then call Describe on that instance.