must i include linq in my project c# code example

Example: C# linq include

//If you have a Customer model that contains a list of orders.
//You can include the orders like this
var customersWithOrders = _dbContext.Customers
	.Include(c => c.Orders)
  	.ToList();

//Lets say those orders then contain products. You can include those like so:
var customersWithOrdersAndProducts = _dbContext.Customers
	.Include(c => c.Orders)
  		.ThenInclude(o => o.Products)
  	.ToList();