ASP.NET ValidationMessage validate false my double number

I am using NET MVC, EF 6, Entity Data Model to build a site.This page is "Create Sach In the DB, Table Sach, which have fields: Dai, Rong, Cao as float. When running it's allow only int input

But when debug, I enter 1.2 and 1,2, both value are not valid, though they are double!