In LINQ to SQL, you can easily delete data from a database by removing the corresponding object which is associated with Table<TEntity> collection and then call SubmitChanges() method. LINQ to SQL will translate your changes into the appropriate SQL DELETE commands.
The following code deletes a customer whose first name is "Maria".
using (var db = new CustomerDataContext(@"Data Source=(localdb)\ProjectsV13;Initial Catalog=CustomerDB;"))
{
var customer = db.Customers
.Where(c => c.FirstName == "Maria")
.FirstOrDefault();
db.Customers.DeleteOnSubmit(customer);
db.SubmitChanges();
}