How to evaluate (((2+5)*1000)/((30-12)*6)) at runtime in C#?

using Microsoft.CSharp;
using System;
using System.CodeDom.Compiler;
using System.Data;
using System.Reflection;
using System.Text;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {            
           // object result = Eval("((10 + 12)*5)"); //result 110
            object result = Eval("(((2+5)*1000)/((30-12)*6))"); //result 64
        }

        private static object Eval(string sExpression)
        {
            CSharpCodeProvider c = new CSharpCodeProvider();
            CompilerParameters cp = new CompilerParameters();

            cp.ReferencedAssemblies.Add("system.dll");

            cp.CompilerOptions = "/t:library";
            cp.GenerateInMemory = true;

            StringBuilder sb = new StringBuilder("");
            sb.Append("using System;\n");

            sb.Append("namespace CSCodeEvaler{ \n");
            sb.Append("public class CSCodeEvaler{ \n");
            sb.Append("public object EvalCode(){\n");
            sb.Append("return " + sExpression + "; \n");
            sb.Append("} \n");
            sb.Append("} \n");
            sb.Append("}\n");

            CompilerResults cr = c.CompileAssemblyFromSource(cp, sb.ToString());
            if (cr.Errors.Count > 0)
            {
                throw new InvalidExpressionException(
                    string.Format("Error ({0}) evaluating: {1}",
                    cr.Errors[0].ErrorText, sExpression));
            }

            Assembly a = cr.CompiledAssembly;
            object o = a.CreateInstance("CSCodeEvaler.CSCodeEvaler");

            Type t = o.GetType();
            MethodInfo mi = t.GetMethod("EvalCode");

            object s = mi.Invoke(o, null);
            return s;

        }
    }
}