how to save multiple records by clicking single click

I am developing application in asp.net mvc core.I want to save multiple records by single save button

I used "https://www.aspsnippets.com/Articles/Insert-Save-Multiple-rows-records-to-database-using-Entity-Framework-in-ASPNet-MVC.aspx"

In the code everything is working fine but in customers.push(customer) .customers does not have values .It is showing 0 in " InsertCustomers" function in

customercontroller

i have given code in attachment and it is urgent one.Is there any other sample to continue the project?

Please help me