If you want to make sure your jQuery code is solid, you can make a dummy service and test against that as well, which might help you isolate your problem. The jQuery you posted looks just fine.

var emptyUserNameMessage = ‘Please enter the username’;
var progressUserNameMessage = ‘Checking…’;
var availableUserNameMessage = ‘Username is available’;
var usedUserNameMessage = ‘Username has been taken’;

$(function () {
var userNameAvailabilityLabel = $(“#UserNameAvailabilityLabel”);

$(“#username”).blur(function () {
var userNameTextBox = $(“#username”);
var userName = userNameTextBox.val();
if ($.trim(userName) == ”) {
userNameAvailabilityLabel
.removeClass()
.addClass(‘required1′)
.html(emptyUserNameMessage);
}
else {
userNameAvailabilityLabel.html(”);
$(“#ProgressDiv”).show();

$.ajax({
type: “POST”,
url: “forumApp/Checkavailability.asmx/CheckUserNameAvailability”,
data: “{userName: \”" + userNameTextBox.val() + “\”}”,
contentType: “application/json; charset=utf-8″,
dataType: “json”,
success: OnCheckUserNameAvailabilitySuccess,
error: OnCheckUserNameAvailabilityError
});
}
return false; //Prevent postback
});

function OnCheckUserNameAvailabilitySuccess(response) {
$(“#ProgressDiv”).hide();
if (response != null && response.d != null) {
var data = response.d;
switch (data) {
case 0:
userNameAvailabilityLabel
.removeClass()
.addClass(‘available’)
.html(availableUserNameMessage);
$(“#btnSubmit”).removeAttr(‘disabled’);
break;
case 1:
userNameAvailabilityLabel
.removeClass()
.addClass(‘used’)
.html(usedUserNameMessage);
$(“#btnSubmit”).attr(‘disabled’, ‘disabled’);
break;
}
}
}
function OnCheckUserNameAvailabilityError(xhr, ajaxOptions, thrownError) {
alert(xhr.statusText);
}
});

You could potentially use the Strategy pattern and define which strategy is going to be used at runtime. Then you know you are calling on only the strategy implementation you need.

Are you passing your entities directly to your web project or just using DTO’s? I would recommend looking at the Sharp Architecture project for a better idea of structuring dependencies.

web Project (controller) — this creates the container and installs the components.
|
| references
V
Service Project — this has the Services (example UserService — login(), retirevepassword() etc.)
entity Project — this has all the POCOS (EF mappings), Service, Repository Interfaces (IUserService etc.)
|
|
V
Repository Project — this has Repositories (UserRepository — GetUsers(), AddUser(), DeleteUser() etc.)
entity Project — this has all the POCOS (EF mappings), Service, Repository Interfaces (IUserService, IuserRepository etc.)
|
|
V
Data project — This has the entity Framework Data Model

Now, since my web project has reference to Service project and Entity project, I am able to install UserService into container, but since Service has IUserRepository dependency, it is unable to create it due to the fact that web project does not have reference to the Repository project. (even though the interfaces are all in the separate entity project).

Any help would be highly appreciated.

Thanks