using System;
using System.Diagnostics;
using System.Linq;
using System.Collections.Generic;
public class Test
{
	public static void Main()
	{
	        string[] vals = Enumerable.Range(0, 1000000).Select(n => n.ToString()).ToArray();
 
	    	var watch = Stopwatch.StartNew();		
 
	    	List<string> res = vals.Select(x => string.Format("({0})", x)).ToList();
	    	Console.WriteLine ("it took {0} ms for string.Format", watch.ElapsedMilliseconds);
 
	    	watch = Stopwatch.StartNew();	
	    	for (int i = 0; i < vals.Length; i++)
	    	{
	    		vals[i] = "(" + vals[i]  + ")";
	    	}
	    	Console.WriteLine ("it took {0} ms for " +"\'(\' + vals[i]  +\')\';", watch.ElapsedMilliseconds);
	}
}

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