ASP.NET service accessible from .NET but not Java

Revision 3
I have to access Asp.net version 4.0 services through j2me Application, MIDP-2.0. Same J2me code can able to access Asp.net version 2.0 services. I am not able to figure out what and where i have to make changes in my J2me code. Googled a lot for this but didn't get any solution. I need your help guys. My code is as follow :

public String loginVerification(String userId, String pwd){
    String Method_Name = "mLogin";
    //String Method_Name = "LoginCheck";
    try{
    SoapObject request = new SoapObject(Constants.NAMESPACE_URL, Method_Name);
    request.addProperty("userid", userId);
    request.addProperty("password", pwd);
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);
    HttpTransport ht = new HttpTransport(Constants.LOGIN_URL);
    ht.debug = true;
    ht.call(Constants.NAMESPACE_URL+Method_Name, envelope); // getting error here
    SoapPrimitive result = (SoapPrimitive) envelope.getResponse();
    return result.toString();
    }catch(IOException e){
        return e.getMessage().toString();
    }catch(XmlPullParserException e){
        return e.getMessage().toString();
    }

}

My web Service is as follows.

[WebMethod]
    public string mLogin(string userid, string password)
    {
        string message = string.Empty;
        CommonDataEntity cd = new CommonDataEntity();
         sqlfilter filter = new sqlfilter();
        int retVal=cd.Select_CustomerLogin(filter.SqFilter(userid), filter.SqFilter(password), out message);

        if (retVal > 0 && message == "User")
        {

            
            return "true#"+cd.mLogin(userid);

        }
        else
        {
            return "false#"+userid;
        }
    }

I'm using Ksoap2-j2me-core 2.12 jar to access the Asp services.

Please help me out from this.:-)