The built-in validation of the Spreadsheet works on the client: https://demos.telerik.com/aspnet-mvc/spreadsheet/validation
Nevertheless, when you upload an excel file, the data is exposed via a Workbook instance on the server: https://demos.telerik.com/aspnet-mvc/spreadsheet/server-side-import-export
. This instance allows you to access the data and modify it if needed, so you can perform a custom validation at that point.
ActionResult Upload(HttpPostedFileBase file)
var workbook = Workbook.Load(file.InputStream, Path.GetExtension(file.FileName));
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