Set Ellipsis class in Bootstrap DataTable column in ASP.Net

I have a datatable where for the specific column i want to set ellipsis class that means if the text is 

Example: hi this is a test.I need to test externelreference

Become :hi this is......

I have tried below way but not working

{
    data: "ExternalReference",
    name: "ExternalReference",
    orderable: false,
    className: "hidden-xs ellipsis",
},