C# - ?? Operator

C# 2.0 has the little-known ?? (double question mark) operator which returns the second operand if the first operand is null. It's the equivalent of the NVL or COALESCE function in SQL.

Example:
using System;

class Program
{
static void Main(string[] args)
{
int? cole = null;
string str1 = null;

Console.WriteLine(cole ?? 4);
Console.WriteLine(str1 ?? "Nitin");

Console.ReadLine();
}
}