# Tracking Changes
## Content
The **CollectionView** class can keep track of changes made to the data. It is useful in situations where you must submit changes to the server. To turn on change tracking, set the **TrackChanges** property to true. Once you do that, the **CollectionView** starts tracking the changes made to the data and exposes them using the following:
* **ItemsEdited**: This list contains items that are edited using the **BeginEdit** and **CommitEdit** methods.
* **ItemsAdded**: This list contains items that are added using the **AddNew** and **CommitNew** methods.
* **ItemsRemoved**: This list contains items that are removed using the **Remove** method.
> type=note
> Make sure that the **DisableServerRead** property of [ItemSource](/componentone/api/mvc/online-mvc-core/dotnet-api/C1.AspNetCore.Mvc/C1.Web.Mvc.IItemsSource-1.html) is set to **True** if filtering, paging, sorting is to be performed on data available at client side only.
The example uses **C1NWind** datasource, for which the configuration in the [Quick Start](/componentone/docs/mvc/online-mvc-core/WorkingwithControls/CollectionView/CVQuickStart) application. The following image shows how the FlexGrid appears after the **TrackChanges** property is set to **true**.
The following code example demonstrates how to initialize a FlexGrid, and keep a track of changes by using **TrackChanges** property of the CollectionView.
#### In Code
**TrackChangesController.cs**
```csharp
private C1NWindEntities db = new C1NWindEntities();
public ActionResult Index()
{
return View(db);
}
```
**TrackChanges.cshtml**
### ASP.NET Core
```dotnet
Change the data here
See the changes here
Items edited:
Items added:
Items removed:
```
### JS
```javascript
```