Kendo UI reference not working in Razor view

I had the same problem. The third point mentioned below solved the problem in my case.

1. Include the JavaScript and CSS files: The ordering of scripts and css files is also very important. jQuery should be included before the KendoUI script file(s).

2. Add reference to Kendo.Mvc.dll: Right-click the References node in Solution Explorer and click Add Reference. Select the Browse tab of the Add Reference dialog and navigate to the install location of Telerik UI for ASP.NET MVC.

3. Update the web.config in Views folder: Open Views/Web.config (or root Web.config if using ASPX). Locate the namespaces tag. Append an below add tag to the namespaces tag.

<add namespace="Kendo.Mvc.UI" />

I just added the below line in razor page. Its working for me.

@using Kendo.Mvc.UI;

The problem is that you have not included a reference to the Kendo.Mvc.dll. There's an explanation on how to do this in the documentation located here

By default the the root kendo directory is installed at C:\Program Files (x86)\Telerik