Error - ProcessAndDisplayNumber

Error	1	The name 'ProcessAndDisplayNumber' does not exist in the current context	C:\Documents and Settings\Eddy Ho\My Documents\Visual Studio 2005\Projects\Project-213\Project-213\Program.cs	37	13	Project-213
Error	2	The name 'ProcessAndDisplayNumber' does not exist in the current context	C:\Documents and Settings\Eddy Ho\My Documents\Visual Studio 2005\Projects\Project-213\Project-213\Program.cs	38	13	Project-213
Error	3	The name 'ProcessAndDisplayNumber' does not exist in the current context	C:\Documents and Settings\Eddy Ho\My Documents\Visual Studio 2005\Projects\Project-213\Project-213\Program.cs	39	13	Project-213



namespace Project_213
{
   delegate void DoubleOp(double value);
   class MathOperations
    {
        public static void MultiplyByTwo(double value)
        {
            double result = value * 2;
            Console.WriteLine("Multiplying by 2: {0} gives {1}", value, result);
        }
        public static void Square(double value)
        {
            double result = value * value;
            Console.WriteLine("Squaring: {0} gives {1}", value, result);
        }
        
        public static void ProcessAndDisplayNumber(DoubleOp action, double value)
        {
            Console.WriteLine("\nProcessAndDisplayNumber called with value = " + value);
            action(value);
        }
        
    }
           
    class Program
    {        
        static void Main(string[] args)
        {
            DoubleOp operations = new DoubleOp(MathOperations.MultiplyByTwo);
            operations += new DoubleOp(MathOperations.Square);
            ProcessAndDisplayNumber(operations, 2.0);
            ProcessAndDisplayNumber(operations, 7.94);
            ProcessAndDisplayNumber(operations, 1.414);
            Console.WriteLine();
        }
    }
}