using System;

using System.ComponentModel;

using System.Drawing;

public class Program

{

    public static object ChangeType(object value, Type conversionType)

    {

            if (conversionType == null)

            {

                throw new ArgumentNullException("conversionType");

            }

​

            Console.WriteLine("Type is {0}", value.GetType().Name);

​

            if (conversionType.IsValueType)

            {

                TypeConverter converter = TypeDescriptor.GetConverter(conversionType);

​

                Console.WriteLine("IsValid={0}", converter.IsValid(value));

                if (!converter.IsValid(value))

                {

                    return null;

                }

            }

​

            if (conversionType.IsGenericType && conversionType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))

            {

                if (value == null)

                {

                    return null;

                }

​

                NullableConverter nullableConverter = new NullableConverter(conversionType);

                conversionType = nullableConverter.UnderlyingType;

            }

​

            return Convert.ChangeType(value, conversionType);       

    }

    public static void Main()

    {

        bool tf = true;

        object i = 1;

        object c = Color.Azure;

        object o = ChangeType(tf, typeof(bool));

        o = ChangeType(i, typeof(int));

        o = ChangeType(c, typeof(Color));

        if (o == null) Console.WriteLine("Is null");

        else Console.WriteLine("not null");

        Console.WriteLine("Hello World");

    }

}