How to write Linq-To-SQL statment which is equal to my following TSQL?
Update table1
 Set Name = 'John',
     Address = null
where
 ID = 1

var tab = db.Table1.Single(s => s.ID == 3);
                tab.Name = DateTime.Now;
                tab.Address = null;
                db.SubmitChanges();

using (var dataContext = new MyEntities())
{
    var contact = Contacts.Single (c => c.ContactID == 1);
    contact.FirstName = 'John';
    contact.Address= 'Toronto';
    dataContext.SaveChanges();
}

var entity = context.Table1.Single(t => t.Id == 1);

entity.Name = "John";
entity.Address = "Toronto";

context.SubmitChanges();