DataSource Controls :: The Name 'DetailsView1' Does Not Exist In The Current Context

I am new to LINQ, but learning Quickly. I get this error "Error 1 The name 'DetailsView1' does not exist in the current context C:UsersUserdocumentsvisual studio 2010WebSitesDursoftHRAGeneral.aspx.cs 40 9 C:...DursoftHR" for the code behind listed below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class AGeneral : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
viewCompanyInfo();
}.......

"The name 'DetailsView1' does not exist in the current context" is the error I get.