vb.net asmx WebService to accept JSON in HTTP-POST using Android

I am trying to post data to my server (vb.net) using mobile devices. I've researched several great articles on the client-side (Android) including this Encosia article and sending JSON object with Android.

I have created a sample class:

Public Class OneEvaluation

   Private strEmail As String
    Public Property email() As String
        Get
            Return strEmail
        End Get
        Set(ByVal value As String)
            strEmail = value
        End Set
    End Property
    Private strPassword As String
    Public Property password() As String
        Get
            Return strPassword
        End Get
        Set(ByVal value As String)
            strPassword = value
        End Set
    End Property
End Class

and I've created my webmethod:

Public Class AsmxCodebehind
    Inherits System.Web.Services.WebService

<WebMethod()> _
   Public Function AndroidTest(ByVal JSON As OneEvaluation) As String  '
    Dim strSQLInsertCommand As String

    ' code block

    Return "whatever"
End Function

It builds (VS2008 sp1) with no errors. I get no response on the android. If I delete the argument 'JSON as OneEvaluation', it will successfully post in a browser and provide a HTML return; but as coded above... the error is: System.InvalidOperationException: AndroidTest Web Service method name is not valid. at System.Web.Services.Protocols.HttpServerProtocol.Initialize()

FYI, my Android snippet follows:

final String URL = "http://www3.myurl.com/JSON/service.asmx/AndroidTest"

HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
HttpResponse response;
JSONObject json = new JSONObject();

try{
    HttpPost post = new HttpPost(URL);
    json.put("email", email);
    json.put("password", pwd);
    StringEntity se = new StringEntity( "OneEvaluation: " + json.toString());  
    //   post.setEntity(se);
    post.setHeader("Accept", "application/json");
    post.setHeader("Content-type", "application/json; charset=utf-8");
    // se.setContentEncoding((Header) new BasicHeader(HTTP.CONTENT_TYPE, "application/json; charset=utf-8"));

    post.setEntity(new ByteArrayEntity(se.toString().getBytes("UTF8")));
    //   post.setHeader(OneEvaluation, value)
    //   ResponseHandler responseHandler = new BasicResponseHandler();
    response = client.execute(post);
    /* Checking response */
    Log.v("TAG", " JSON onItemClick fired! Position:");

    if(response!=null){
        Log.v("TAG", " Response :" + response.toString());
        //  Toast.makeText(v.getContext(), response, Toast.LENGTH_LONG);
        InputStream in = response.getEntity().getContent(); //Get the data in the entity
    }
}
catch(Exception e){
    e.printStackTrace();
    createDialog("Error", "Cannot Estabilish Connection");
    Log.v("TAG", " Cannot Estabilish Connection");
}

I haven't seen a complete example with both server-side (except those using jQuery) and client side (especially Android). So I hope to save someone else's weekend!

I have resisted using C# on the server side, as my other AJAX/JSON services (including those that return JSO开发者_如何学GoN) are in vb (and working).

I'm asking for help with the server side error... and any suggestions to clean up the Android JSON HTTP_POST.

Many Thanks in advance !

Whew! I couldn't have done it without Fiddler and some GREAT posts, like this answer from @Mark-Schultheiss.

Also, future travelers... beware that the correct data format for your JSON is expected!

{"JSON": {"email":"kiddin","password":"no"}} was the only way it was accepted. Single Quot is unacceptable... so escape a double quote (\") into the code and call the methodname (ie JSON) - not the class.

I couldn't have done it without testing using a webpage using jQuery. I recommend this blog... http://encosia.com/3-mistakes-to-avoid-when-using-jquery-with-aspnet-ajax/'> Encosia from @Dave-Ward. Just remember, I had to use double quotes rather than the mentioned single quote.