C#

//query for student with id = 2
var q = from d in sdc.student
        where d.id == 2
        select d;

//getting the first result or null if there is no student
var row = q.FirstOrDefault();

//if there is a result, we update it
if (row != null)
{
    row.school_ID = null;
}

//saving changes to DB
sdc.SubmitChanges()

var q = (from d in sdc.student
        where d.id == 2        
        select d).FirstorDefault();

try {if (q != null) q.school_ID = null;} cathc{ }

int k = 0;
var q = (from d in sdc.student
        where d.id == 2        
        select d).FirstorDefault();
// make exception Division by constant zero	
try {if (q != null) k = 1/k;} catch { q.school_ID = null;}

// no need for private int number;
public int Number { get; set; }

DaveyM69 wrote:

although it can have a private accessor

private int number1;
private int number2;

public int Sum
{
    get { return number1 + number2; }
}