Question

TSQL:-

Update table1
 Set Name = 'John',
     Address = null
where
 ID = 1

LINQ-TO-SQL

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

Answer 1

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