simple color shading

Color.cs

using System;
					
public class Program
{
    public static void Main()
    {
	Func<string,double,string> shade = (hex, pct) => {
		Func<int,int,int,int> clamp = 
			(value,min,max) => value < min ? min : value > max ? max : value;
		var num = Convert.ToUInt32(hex.Replace("#",""),16);
		int amt = (int)Math.Round(2.55 * pct);
		int R = (int)((num >> 16) + amt);
		var G = (int)((num >> 8 & 0x00FF) + amt);
		var B = (int)((num & 0x0000FF) + amt);
		var C = (0x1000000 + (clamp(R,0,0xFF) * 0x10000 + clamp(G,0,0xFF)*0x100 + clamp(B,0,0xFF))).ToString("X");
		return "#" + C.Substring(1,C.Length - 1);
	};

	Console.WriteLine(shade("#FF00FF",100));
    }
}