The type or namespace name 'Database' could not be found...

Question

ASP.Net WebForm, C#, Visual Studio, SQL Server connection My code is something like this... using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Data.SqlClient; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; private void PopulateList() { // initialize the Database object Database DataStore = new Database(); SqlDataReader dataReader = null; ... DataStore.RunProc("CODES_SELECT_ALL", out dataReader); while (dataReader.Read()) { ... } } C:\Inetpub\wwwroot\WebApplication1\...): The type or namespace name 'Database' could not be found (are you missing a using directive or an assembly reference?) Any ideas for this rookie?