fix: async car update

CarManagerV2/CarDetailsForm.cs

@@ -59,17 +59,29 @@ namespace CarManagerV2
             car.Price = nudPrice.Value;
         }
 
-        private void btnSave_Click(object sender, EventArgs e)
+        private async void btnSave_Click(object sender, EventArgs e)
         {
             // save car to cars.csv and close form
             //saving car... popuo
+            btnSave.Enabled = false;
+            btnDelete.Enabled = false;
             var msgbox = new PleaseWait();
             msgbox.Show();
             Application.DoEvents();
-            StateManager.UpdateCar(car);
-            Image fooimg = ImageManager.GetImage(car);
-            msgbox.Close();
+            await Task.Run(() =>
+            {
+                StateManager.UpdateCar(car);
+            });
+            await Task.Run(() =>
+            {
+                ImageManager.GetImage(car);
+            });
+            btnSave.Enabled = true;
+            btnDelete.Enabled = true;
             this.Close();
+            msgbox.Close();
+            
+
 
         }