static void Modify()
{
NorthwindDataContext context = new NorthwindDataContext();
var result = context.Categories.Where<Category>((cat) => (cat.CategoryID == 48090)).Single<Category>();
result.CategoryName = "Thurston";
context.SubmitChanges();
}
static void MyDel()
{
NorthwindDataContext context = new NorthwindDataContext();
var result = (from item in context.Categories
where item.CategoryID == 48090
select item).Single<Category>();
context.Categories.DeleteOnSubmit(result);
context.Products.DeleteAllOnSubmit<Product>(result.Products);
context.SubmitChanges();
}