Hi Dario,

The Telerik UI Grid for ASP.NET Core can be programmatically exported via the excelExport() method. More information could be found in the article below:

https://docs.telerik.com/kendo-ui/api/javascript/ui/grid/events/excelexport

Within the click event handler of a button obtain an instance of the Telerik UI Grid and export it programmatically. Here is an example:

@(Html.Kendo().Button()
        .Name("primaryTextButton")
        .HtmlAttributes( new {type = "button", @class = "k-primary" } )
        .Content("Export Grid")
        .Events(e => e.Click("exportGrid")))

Function for the Excel export:

function exportGrid() {
            var grid = $("#Grid").data("kendoGrid");
            grid.saveAsExcel()
        }

I hope this information helps. I will be glad to assist you further. 

Regards,
Anton Mironov
Progress Telerik