add entity framework code example

Example 1: entity framework insert

var id = Guid.NewGuid();

 // insert
 using (var db = new EfContext("name=EfSample"))
 {
    var customers = db.Set<Customer>();
    customers.Add( new Customer { CustomerId = id, Name = "John Doe" } );

    db.SaveChanges();
 }

Example 2: entity framework core

cd %ProjectDirectory%
dotnet ef dbcontext scaffold "connectionstring" Microsoft.EntityFrameworkCore.SqlServer -o Models --force