What are LINQ to SQL queries and how do I use them?

What are LINQ to SQL queries and how do I use them?

LINQ to SQL is a .NET Framework component that provides a runtime infrastructure for managing relational data as objects. You can use it to query databases using C# or VB.NET.

Can you show me a simple example of a LINQ to SQL query?

Sure! Here's a basic example: var query = from c in db.Customers where c.City == "London" select c; This retrieves all customers from London.

How do I insert a new record using LINQ to SQL?

To insert a new record, you can create a new object and add it to the table. For example: db.Customers.InsertOnSubmit(new Customer { Name = "John Doe", City = "New York" }); db.SubmitChanges();

What about updating an existing record?

To update a record, first retrieve it, modify the properties, and then call SubmitChanges(). For example: var customer = db.Customers.First(c => c.CustomerID == 1); customer.City = "Paris"; db.SubmitChanges();