Use of IsNullOrWhiteSpace

In C# 4.0 we can check whether

1. String is null.
2. String is empty.
3. String contains nothing but whitespace.

All these can be achieved by using string.IsNullOrWhiteSpace

static void Main(string[] args)
        {
            string value1 = "   ";
            Console.WriteLine(string.IsNullOrWhiteSpace(value1));

            string value2 = "";
            Console.WriteLine(string.IsNullOrWhiteSpace(value2));

            string value3 = null;
            Console.WriteLine(string.IsNullOrWhiteSpace(value3));

            Console.Read();
        }

Result

True
True
True