Cannot access OleDBConnection class

Hi,

Am a startup to ASP.NET, seeking guidance from this forum. Please anyone try to get me out from the following problem.
I cannot able to declare OleDBConnection class object variable inside my newly added class. However, that class is getting recognized inside aspx.cs file. I have added the namespaces system.data and system.data.oledb in my class file. But still that class is not getting recognized.

This is my class file coding :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.OleDb;

namespace clsCommon
{

public class clsCommon
{
}
}


If i try to declare variable for OleDBConnection class it ...