How to convert a string formula into an int?

here a quick and dirty solution :
http://www.odetocode.com/Code/80.aspx

I do not run it in batch and so I changed the code.

Evaluator.EvalToInteger(F);

It throws nullpointer exception when executing object EvalToObject

Should I import any dll or library?

It is Dot net framework 2.0

using System;
using System.Reflection;
using System.Collections.Generic;
using System.Text;
 
public class Evaluator
    {
        public static int EvalToInteger(string statement)
        {
            string s = EvalToString(statement);
            return int.Parse(s.ToString());
        }
 
        public static double EvalToDouble(string statement)
        {
            string s = EvalToString(statement);
            return double.Parse(s);
        }
 
        public static string EvalToString(string statement)
        {
            object o = EvalToObject(statement);
            return o.ToString();
        }
 
        public static object EvalToObject(string statement)
        {
            return _evaluatorType.InvokeMember(
                        "Eval",
                        BindingFlags.InvokeMethod,
                        null,
                        _evaluator,
                        new object[] { statement }
                     );
        }
 
        private static object _evaluator = null;
        private static Type _evaluatorType = null;
}

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The point is to use Jscript`s eval function. so you you need "using Microsoft.JScript"
also, did you fully read the explanations at the top of the page????

"solution is to add a JScript.NET project to your solution"
"To compile, make sure you add a reference to the Microsoft.JScript assembly"

I use VS2005 and there is only J# project, but no JScript.NET project.

I added  Microsoft.JScript dll and using it. But, still nullreferenceexception

Is there any other way to do purely in VC#?

Yes, it works in C#.

Thanks for help