CheckBox function for same ss billing sddress - angularjs

Question

i know its very common and very easy thing but really i m very new to angularjs and need your help
My View Page:
<div ng-controller="AddressController">
<div class="form-part-title" ng-show="Caption">{{Caption}} <span ng-show="showSameAsBilling" class="spancheck"><input type="checkbox" id="SameAsBilling" ng-model="Address.SameAsBilling"><label class=" after">Same As Billing Address</label></span> </div>
<div ng-show="!readOnly">
<label class="required">#Resource.Country<span ng-show="showInvalidAddress" class="spancheck"><input type="checkbox" id="InvalidAddress" ng-model="Address.InvalidAddress"><label class="after">Invalid Address</label></span>
<span ng-show="showPostalOnly" class="spancheck"><input type="checkbox" id="PostalOnly" ng-model="Address.PostalOnly"><label class="after">Postal Only</label></span>
</label>
<select kendo-drop-down-list class="sdk-dropdown" ng-model="Address.CountryId" k-options="countries" k-on-change="onChange(kendoEvent)" />
<label>#Resource.Address</label>
<input class="block" type="text" name="Address" ng-model="Address.Address1" maxlength="100" />
<input class="block" type="text" ng-model="Address.Address2" maxlength="100" />
<input class="block" type="text" ng-model="Address.Address3" maxlength="100" />
<label id="lblState">{{StateLabel}}</label>
<select kendo-drop-down-list class="sdk-dropdown" ng-model="Address.StateProvinceId" k-options="states" k-rebind="states" />
<label>#Resource.City</label>
<input class="block" type="text" name="City" ng-model="Address.City" maxlength="50" />
<label>{{ZipCodeLabel}}</label>
<input class="block" type="text" name="ZipCode" ng-model="Address.ZipCode" maxlength="50" />
</div>
<div ng-show="readOnly">
<textarea style="min-height:120px!important" disabled>{{Address.Address}}{{Address.Address1}}
{{Address.Address2}}
{{Address.City}}
{{Address.State}}{{Address.CountryName}}
{{Address.ZipCode}}</textarea>
</div>
</div>
My Angular Controller:
var AddressController = function ($scope, $http, $routeParams, $location) {
$scope.StateLabel = "State";
$scope.ZipCodeLabel = "Zip Code";
$scope.countryDataSource = {
transport: {
read: {
dataType: "json",
url: "/ApplicationData/GetCountries",
}
}
};
$scope.countries = {
dataSource: $scope.countryDataSource,
dataTextField: "Name",
dataValueField: "Id",
optionLabel: "Select..."
};
this.showAlert = function () {
alert("this is test method");
};
$scope.onChange = function (e) {
var countryId = e.sender.value();
if (countryId == 2) {
$scope.StateLabel = "Province";
$scope.ZipCodeLabel = "Postal Code";
}
else {
$scope.StateLabel = "State";
$scope.ZipCodeLabel = "Zip Code";
}
$http.get('/ApplicationData/GetStates/' + countryId).
success(function (jsonData, status, headers, config) {
console.log(jsonData);
var data = {
dataSource: jsonData,
dataTextField: "Name",
dataValueField: "Id",
optionLabel: "Select..."
};
$scope.states = data;
}).
error(function (data, status, headers, config) {
console.log("error getting countries");
});
};
$scope.SameAsBilling = function (checked) {
alert(1);
if (SameAsBilling.checked = true) {
vmCustomer.BillingAddress = vmCustomer.ShippingAddress
}
};
};
AddressController.$inject = ['$scope', '$http', '$routeParams', '$location'];
i need you guys to help me with the below function
$scope.SameAsBilling = function (checked) {
alert(1);
if (SameAsBilling.checked = true) {
vmCustomer.BillingAddress = vmCustomer.ShippingAddress
}
};
i m tying but don't know why the check box is not talking to controller please help