There is not a separate live demo for adding a new item for Kendo UI Core because mostly the logic is executed on the client. The approaches for the ASP.NET MVC and ASP.NET Core are similar.
Regarding the Create Action method in the data source, it appears that declaring only Read Action method is allowed. What you can do is to instantiate the DataSource separately and set up the Create Action method there.
I created a sample project to demonstrate how the aforementioned live demo could be implemented using Kendo UI for ASP.NET Core. What I have done differently:
- Declare the DataSource component outside the MultiSelect widget.
- Attach the RequestEnd event to the widget.
- Set the NoDataTemplateId and paste the template in a separate script tag.
- Included a dummy data in the HomeController along with the Read and Create Action methods.
Should you need further clarifications, feel free to contact me.
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