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ListBox in Razor Pages

Updated on Dec 10, 2025

This article describes how to seamlessly integrate and configure the Telerik UI ListBox for ASP.NET Core in Razor Pages applications.

You can use any of the available data binding approaches to bind the component to data in a Razor Pages application.

Referencing Handler Methods in Razor Pages

Razor Pages is an alternative to the MVC pattern that makes page-focused coding easier and more productive. This approach consists of a cshtml file and a cshtml.cs file (by convention, the two files have the same name).

The cshtml.cs file, known as the PageModel, contains handler methods that respond to HTTP requests. These methods are prefixed with On followed by the HTTP verb (for example, OnGet, OnPost, OnPostRead, OnPostCreate).

Handler methods declared in a PageModel can be referenced from any Razor Page using one of the following URL patterns:

Using Url.Page()
C#
```
Url.Page("PageName", "HandlerName")
// OR
Url.Page("/FolderName/PageName", "HandlerName")
```
For example, Url.Page("Index", "Read") references the OnPostRead or OnGetRead handler method in the Index.cshtml.cs file.
Using a query string
C#
```
Url("/PathToPage?handler=HandlerName")
```
For example, Url("/Index?handler=Read") references the OnPostRead or OnGetRead handler method in the Index page.

For more information on Razor Pages architecture and concepts, refer to the official Microsoft documentation.

Binding to Remote Data

The DataSource component offers the most versatile data binding approach. To connect the ListBox to a data set retrieved from a remote endpoint in a Razor Pages application, proceed with the following steps:

Specify the Read request URL in the DataSource configuration. The URL must refer to the method name in the PageModel.

Razor
    @page
    @model IndexModel

    @(Html.Kendo().ListBox()
    .Name("optional")
    .DataTextField("Text")
    .DataValueField("Value")
    .Toolbar(toolbar =>
    {
        toolbar.Position(ListBoxToolbarPosition.Right);
        toolbar.Tools(tools => tools
            .MoveUp()
            .MoveDown()
            .TransferTo()
            .TransferFrom()
            .TransferAllTo()
            .TransferAllFrom()
            .Remove()
        );
    })
    .DataSource(ds => ds
        .Read(r => r.Url(Url.Page("Index", "ReadOptional")).Data("forgeryToken"))
    )
    .ConnectWith("selected")
)

@(Html.Kendo().ListBox()
    .Name("selected")
    .DataTextField("Text")
    .DataValueField("Value")
    .Selectable(ListBoxSelectable.Multiple)
)
Razor
    @page
    @model IndexModel

    @{
        var tools = new string[] {
            "moveUp",
            "moveDown",
            "transferTo",
            "transferFrom",
            "transferAllTo",
            "transferAllFrom",
            "remove"
        };
    }

    <kendo-listbox name="optional" datatextfield="Text" datavaluefield="Value" connect-with="selected">
        <datasource>
            <transport>
                <read url="@Url.Page("Index", "ReadOptional")" data="forgeryToken"/>
            </transport>
        </datasource>
        <toolbar position="ListBoxToolbarPosition.Right" tools="tools"/>
    </kendo-listbox>

    <kendo-listbox name="selected" datatextfield="Text" datavaluefield="Value" selectable="ListBoxSelectable.Multiple" />

Add an AntiForgeryToken at the top of the page.

Razor

    @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
    @Html.AntiForgeryToken()

Send the AntiForgeryToken with the Read request.

    <script>
        function forgeryToken() {
            return kendo.antiForgeryTokens();
        }
    </script>

Additional parameters can also be supplied.

    <script>
        function forgeryToken() {
            return {
                __RequestVerificationToken: kendo.antiForgeryTokens().__RequestVerificationToken,
                additionalParameter: "test"
            }
        }
    </script>

Within the cshtml.cs file, add a handler method for the Read operation that returns the dataset.

public class IndexModel : PageModel
{
    public static IList<SelectListItem> items;

    public void OnGet()
    {
        if (items == null)
        {
            items = new List<SelectListItem>();
            Enumerable.Range(1, 5).ToList().ForEach(f => items.Add(new SelectListItem
            {
                Value = "" + f,
                Text = "Text " + f
            }));
        }
    }

    public JsonResult OnPostReadOptional()()
    {
        return new JsonResult(items);
    }
}

For the complete project, refer to the ListBox in Razor Pages example.

Binding to a PageModel Property

To bind the ListBox to a property from the PageModel, follow the next steps:

Add a property to the PageModel that holds the data collection that must be loaded in the ListBox.

    public class ListBoxPageModel : PageModel
    {
        [BindProperty]
        public IList<SelectListItem> items { get; set; }

        public void OnGet()
        {
            if (items == null)
            {
                items = new List<SelectListItem>();
                Enumerable.Range(1, 5).ToList()
                    .ForEach(f => items.Add(new SelectListItem
                    {
                        Value = "" + f,
                        Text = "Text " + f
                    })
                );
            }
        }
    }

Declare the PageModel at the top of the page.
Razor
```
    @model ListBoxPageModel
```

Bind the ListBox to the collection property and disable the server data operations (ServerOperations(false)).

Razor
    @page
    @model ListBoxPageModel

    @(Html.Kendo().ListBox(Model.items)
        .Name("optional")
        .DataTextField("Text")
        .DataValueField("Value")
        .Toolbar(toolbar =>
        {
            toolbar.Position(ListBoxToolbarPosition.Right);
            toolbar.Tools(tools => tools
                .MoveUp()
                .MoveDown()
                .TransferTo()
                .TransferFrom()
                .TransferAllTo()
                .TransferAllFrom()
                .Remove()
            );
        })
        .ConnectWith("selected")
    )

    @(Html.Kendo().ListBox()
        .Name("selected")
        .DataTextField("Text")
        .DataValueField("Value")
        .Selectable(ListBoxSelectable.Multiple)
        .BindTo(new List<SelectListItem>())
    )
Razor
    @page
    @model ListBoxPageModel

    @{
        var tools = new string[] {
            "moveUp",
            "moveDown",
            "transferTo",
            "transferFrom",
            "transferAllTo",
            "transferAllFrom",
            "remove"
        };

        var selectedItems = new List<SelectListItem>();
    }

    <kendo-listbox name="optional" datatextfield="Text" datavaluefield="Value" connect-with="selected" bind-to="@Model.items">
        <toolbar position="ListBoxToolbarPosition.Right" tools="tools"/>
    </kendo-listbox>

    <kendo-listbox name="selected" datatextfield="Text" datavaluefield="Value" selectable="ListBoxSelectable.Multiple" bind-to="selectedItems"/>

ListBox in Razor Pages

Referencing Handler Methods in Razor Pages

Binding to Remote Data

Binding to a PageModel Property

See Also