namespace for DataAcess in C#

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SQL-Server-2005

C#

ASP.NET

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Hello,

I am getting an error saying

The type or namespace name 'DataAcess' could not be found (are you missing a using directive or an assembly reference?)

the following namespaces included in my cs page.

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;

i searched in google also but am not getting. please tel me what are all the namespaces i have to include.

I am getting error in this DataAcess data=new DataAcess();

please help me to come out of this asap.