DataServices get current user name.

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.NET

OData

Dear,

I have created data services, below is my login code working fine.

var _url = "http://localhost/CMWeb/DataService.svc/Users?$filter=UserName eq '" + "Basit" + "' and Password eq '" + "s" + "'&$format=json";
            UserAdmin = 0,
            $.ajax({
                type: "GET",
                url: _url,
                timeout: 10000,
                async: false,
                dataType: "json",
                contentType: "application/jsonp; charset=utf-8",
                success: function (data) {

                    debugger;

                    if (data.d.length > 0 && data.d[0].UserEnabled == 1) {
                        UserAdmin = data.d[0].UserAdmin
                    //redirect to main page
                    } else {
                        //show alter message.
                    }
                },
                error: function (xhr, status, error) { 

                }
            });

In Data services DataService.svc

After login i want to get current user
that's why i wrote

<QueryInterceptor("CustomersCalls")> _
Public Function OnQueryOrders() As Expression(Of Func(Of CustomersCall, Boolean))

    'Dim User As System.Security.Principal.IPrincipal
    'User = System.Web.HttpContext.Current.User
    'Dim user = Membership.GetUser(HttpContext.Current.User.Identity.Name)

    Return Function(c) c.CreatedBy = User.Identity.Name
End Function

but i got only computer name, how to get the current user.

Thanks
Basit.