using System;
using System.Text;
using System.Reflection;
class MainClass {
public static void Main() {
Type type = typeof(StringBuilder);
Type[] argTypes = new Type[] { typeof(System.String), typeof(System.Int32) };
ConstructorInfo cInfo = type.GetConstructor(argTypes);
object[] argVals = new object[] { "Some string", 30 };
StringBuilder sb = (StringBuilder)cInfo.Invoke(argVals);
Console.WriteLine(sb.ToString());
}
}