How to check object is null or empty in C#.NET 3.5?

Question

If objects contains null or empty then how to validate or check the condition for the same?

How to bool check whether object obj is null or

Answer 1

class Program
{
    static void Main(string[] args)
    {
        object obj = DBNull.Value;
        if(obj != DBNull.Value) {
            double d = Convert.ToDouble(obj);
            Console.WriteLine(d.ToString());
        }
    }
}