using System;
using System.Linq.Expressions;

namespace ExpressionTreeTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var result = Expression.Parameter(typeof(int), "result");

            var label = Expression.Label(typeof(int));

            var writeStringInfo = typeof(Console).GetMethod("WriteLine", new [] { typeof(int) });

            var block = Expression.Block(
                new[] { result },
                Expression.Assign(result, Expression.Constant(0)),
                Expression.Loop(
                    Expression.IfThenElse(
                        Expression.LessThan(result, Expression.Constant(100)),
                        Expression.Block(
                            Expression.Call(null, writeStringInfo, result),
                            Expression.PostIncrementAssign(result)
                        ),
                        Expression.Break(label, result)
                    ),
                    label
                )
            );

            var action = Expression.Lambda<Action>(block).Compile();
            action();
        }
    }
}