What is the difference between old ADO .NET and Entity framework coding techniques?

Ado.Net - Database should be ready, Entity Framework you can create database by code first approach.

Entity Framework and the system will automatically produce objects for you. and ADO.Net is not doing this much.

When you used ADO, you connected to the database and had to define a stored procedure or query to retrieve data. With Entity framework, you don’t have to be “blind” when it comes to your tables. ADO did not allow you to get the table structure. With code first, you already have the table structure and Entity framework connects to the database and hides any connection processes. With Entity framework, you’re more aware of the database structure, which helps you avoid any coding mistakes. In addition, if the table structures change, Entity framework updates the data models for you during a refresh.