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var jsonText = JSON.stringify({ username: credentials.username, role:credentials.role });
        $.ajax({
            type: "POST",
            url: 'Service.aspx/GetDropdownUsers',
            data: jsonText,
            contentType: "application/json; charset=utf-8",
            dataType: "json"
        })
        .success(function (data) {
            // The data was successfully returned
            console.log("success...");
            var datax = angular.fromJson(data.d);
            callback(datax);
        })
        .error(function () {
            console.log("error...");
        });