Over WEB data synchronization

Hi all,

I use VS, ASP NET.

I would like to achieve over WEB  data synchronization.

I use single SPA ASP.NET/Blazor like DLL web application . 

Let's say two users of mi application works in same time form different location editing for example "Customers" form, both users editing same customer record, let' say customer record of John Smith.

So I would like when user ONE edit something in the customer record of John Smith, the customer TWO too see in real time changes in the record, made by customer ONE.

How this may be done?

Thank you!