# Headers

As of the Telerik UI for ASP.NET MVC R3 2019 release, you can set request headers by using the `Headers` configuration option of the DataSource.

The following example demonstrates how to use the `Headers` option to set a request header.

```Razor HtmlHelper
    @(Html.Kendo().DataSource<OrderViewModel>()
        .Name("myDataSource")
        .Ajax(d => d.Read(r => r.Action("ReadOrders", "Home").Headers(new { header1 = "test" })))
    )

    <script>
        myDataSource.read(); // The header will be set in the request that is sent to the HomeController ReadOrders action.
    </script>  
```

```C# HomeController

    public ActionResult ReadOrders([DataSourceRequest]DataSourceRequest request)
    {
        // Get the request header "header1".
        var Header1Value = Request.Headers["header1"];
        // Orders can be IQueriable or IEnumerable.
        return Json(orders.ToDataSourceResult(request));
    }
```

## See Also

* [Server-Side API](https://www.telerik.com/aspnet-mvc/documentation/api/datasource)