using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
public class Tester
{
public static void Main()
{
Type theMathType = Type.GetType("System.Math");
Type[] paramTypes = new Type[1];
paramTypes[0] = Type.GetType("System.Double");
MethodInfo CosineInfo = theMathType.GetMethod("Cos", paramTypes);
Object[] parameters = new Object[1];
parameters[0] = 45 * (Math.PI / 180);
Object returnVal = CosineInfo.Invoke(theMathType, parameters);
Console.WriteLine(returnVal);
}
}