diff --git a/lib/controller/cart_controller.dart b/lib/controller/cart_controller.dart
new file mode 100644
index 0000000..8ef9a56
--- /dev/null
+++ b/lib/controller/cart_controller.dart
@@ -0,0 +1,68 @@
+import 'package:get/get.dart';
+import '../models/product_model.dart';
+import 'package:collection/collection.dart';
+
+import '../models/product_model1.dart';
+
+class CartController extends GetxController {
+
+  var cartList = <Product>[].obs;
+  var cartCount = 0.obs;
+  var totalPrice = 0.0.obs;
+  var subtotal = 0.0.obs;
+  var gstTotal = 0.0.obs;
+  var grandTotal = 0.0.obs;
+
+  // Add item to cart
+  void addToCart(Product product) {
+    var existingProduct = cartList.firstWhereOrNull((p) => p.id == product.id);
+    if (existingProduct != null) {
+      // Update quantity if already in cart
+      existingProduct.quantity++;
+    } else {
+      // Add new product to cart
+      cartList.add(product);
+    }
+    cartCount.value = cartList.length;
+    updateTotalPrice();
+  }
+
+  void updateTotalPrice() {
+    double subTotal = 0.0;
+    double gstTotalAmount = 0.0;
+
+    for (var product in cartList) {
+      subTotal += product.price * product.quantity;
+      gstTotalAmount += (product.price * product.quantity * (product.gst / 100));
+    }
+
+    subtotal.value = subTotal;
+    gstTotal.value = gstTotalAmount;
+    grandTotal.value = subtotal.value + gstTotal.value;
+  }
+
+  // Increase the quantity of a product
+  void increaseQuantity(Product product) {
+    final index = cartList.indexWhere((item) => item.id == product.id);
+    if (index != -1) {
+      cartList[index].quantity++;
+      updateTotalPrice();
+    }
+  }
+
+  // Decrease the quantity of a product
+  void decreaseQuantity(Product product) {
+    final index = cartList.indexWhere((item) => item.id == product.id);
+    if (index != -1 && cartList[index].quantity > 1) {
+      cartList[index].quantity--;
+      updateTotalPrice();
+    }
+  }
+
+  // Remove item from cart
+  void removeFromCart(Product product) {
+    cartList.removeWhere((item) => item.id == product.id);
+    cartCount.value = cartList.length;
+    updateTotalPrice();
+  }
+}
diff --git a/lib/screens/product/cart_screen.dart b/lib/screens/product/cart_screen.dart
index f2022a7..2001d60 100644
--- a/lib/screens/product/cart_screen.dart
+++ b/lib/screens/product/cart_screen.dart
@@ -27,7 +27,7 @@ class _CartScreenState extends State<CartScreen> {
   void initState() {
     super.initState();
     if (widget.productModel != null) {
-      _cartController.addToCart(widget.productModel);
+      _cartController.addToCart(widget.productModel!);
     }
   }
 
diff --git a/lib/widgets/product_card.dart b/lib/widgets/product_card.dart
index dab5b0e..026e00e 100644
--- a/lib/widgets/product_card.dart
+++ b/lib/widgets/product_card.dart
@@ -187,7 +187,7 @@ class _ProductCardState extends State<ProductCard> {
                     SizedBox(width: 20.0,),
                     IconButton(
                       onPressed: () {
-                        _cartController.removeFromCart(widget.productModel);
+                        _cartController.removeFromCart(widget.productModel!);
                       },
                       icon: const Icon(
                         Icons.delete_outline_rounded,