assemblies in rdlc reports in asp.net

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ASP.NET

hi sir ,please help me.

this is my class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace rsCustomAssembly
{
   public  class Utilities
    {
       public string Concat(string string1, string string2)
       {
           return string1 + "" + string2;
       }
    }
}

in rdlc properies i have given reference rsCustomAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null , and in class name i have added class(Utilities) and instance name(HelpClass)..

i have taken one text box in rdlc report in the expression i have given like this Code.HelpClass.Concat("power","one")..i am getting error's

Error 1 Error while loading code module: ‘rsCustomAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’. Details: Could not load file or assembly 'rsCustomAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified. D:\praveen\RDLCExample\RDLCExample\AssemblyRdlc.rdlc RDLCExample

Error 2 Error in class instance declaration for class Utilities: [BC30002] Type 'Utilities' is not defined. D:\praveen\RDLCExample\RDLCExample\AssemblyRdlc.rdlc RDLCExample