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int a = 1000000;
int b = 4000000;
int l = 1000000;
Stopwatch sw = new Stopwatch();
for(int i=0;i<20;i++)
{
sw.Reset();
sw.Start();
for(int m = 0;m<l;m++)
{
string.Format("{0}", a+m);
}
sw.Stop();
Console.WriteLine(sw.ElapsedMilliseconds);
sw.Reset();
sw.Start();
for (int m = 0; m < l; m++)
{
string.Format("{0}", (b+m).ToString());
}
sw.Stop();
Console.WriteLine(sw.ElapsedMilliseconds);
Console.WriteLine();
}