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string a = "Hello";
DateTime b = System.DateTime.Now;
for (int i = 0; i < 20; i++)
{
a += a;
}
TimeSpan ts1 = System.DateTime.Now - b;
Console.WriteLine(ts1.TotalSeconds.ToString());
StringBuilder sb = new StringBuilder("Hello");
DateTime c = System.DateTime.Now;
for (int i = 0; i < 20; i++)
{
sb.Append(sb);
}
TimeSpan ts2 = System.DateTime.Now - c;
Console.WriteLine(ts2.TotalSeconds.ToString());
Console.ReadLine();