Linq to SharePoint - CRUD operations

Problem: Code to perform CRUD operations against a SharePoint list using Linq to SharePoint.
Resolution:
1) Read:
DataContext dc = new DataContext();
EntityList Customer = dc.GetList("Customers");
var CustomerItems = from Customers in Customer
select Customers;

Alternative approach

2) Insert:

DataContext dc = new DataContext();

CustomersItem Customer = new CustomersItem();

Customer.Title = "Title";

dc.Customers.InsertOnSubmit(Customer);

dc.SubmitChanges();

3) Update:

DataContext dc = new DataContext();

EntityList Customer = dc.GetList("Customers");

var CustomerItems = (from Customers in Customer

where Customers.Id == Convert.ToInt32(txtEditCustomerId.Text)

select Customers).Single();

CustomerItems.Title = CustomerItems.Title + txtCustomerTitle.Text;

dc.SubmitChanges();

4) Delete:

DataContext dc = new DataContext();

EntityList Customer = dc.GetList("Customers");

var CustomerItems = (from Customers in Customer

where Customers.Id == Convert.ToInt32(txtEditCustomerId.Text)
select Customers).Single();
dc.Customers.DeleteOnSubmit(CustomerItems);
dc.SubmitChanges();

Alternative approach 

Tip: If you are using read-only operation in your LINQ to SharePoint queries set ObjectTrackingEnabled to false to improve performance.

DataContext dc = new DataContext();
dc.ObjectTrackingEnabled = false;

Tip: Use the context on the generated proxy for performing LINQ to SharePoint queries.

More Info:
LINQ to SharePoint: CRUD operation on SharePoint 2010 list using SPLinq
LinqPad
LinqPad for SharePoint 2010