using System;

using System.Linq.Expressions;

using System.Collections;

using System.Collections.Generic;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("****************** C# Equivalent Output **************************\n\n");

        Console.WriteLine("First Statment");

        goto JumpTo;

        Console.WriteLine("Second  Statment");

        JumpTo:

        Console.WriteLine("Third Statment and Second Statment is skiped");

​

        Console.WriteLine("\n\n***************** Expression Tree Output **************************\n\n");

        // A label expression of the void type that is the target for the GotoExpression.

        LabelTarget JumpTo = Expression.Label();

​

        // This block contains a GotoExpression.

        // It transfers execution to a label expression that is initialized with the same LabelTarget as the GotoExpression.

        // The types of the GotoExpression, label expression, and LabelTarget must match.

        BlockExpression blockExpr = Expression.Block(

                WriteLineExpression("First Statment"),

                Expression.Goto(JumpTo),

                WriteLineExpression("Second  Statment"),

                Expression.Label(JumpTo),

                WriteLineExpression("Third Statment and Second Statment is skiped")

            );

​

        // The following statement first creates an expression tree,

        // then compiles it, and then runs it.

        Expression.Lambda<Action>(blockExpr).Compile()();

​

    }

​

    public static Expression WriteLineExpression(string s)

    {

        return Expression.Call(null,

           typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),

           Expression.Constant(s));

    }

​

}