call css stylesheet from code behind

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ASP.NET

CSS

Hi there,

I had problem when when call css class from myFile.aspx.vb
there is not prompt any error message...
just the picture that i want not appear in web page.
below is the code for my project:

myFile.aspx.vb

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
         'Put user code to initialize the page here
            _oPortalInfo = PortalInfo.GetCurrentPortalInfo
            DataUtil.InitDataHelper(_oDal, _oPortalInfo.DataAccess.UserId, 
            _oPortalInfo.DataAccess.Password, _oPortalInfo.DataAccess.SecId)
            CheckLinks()

            If Not IsPostBack Then
                LoadTab()
            End If
End Sub

Private Sub LoadTab()
   'load from database

   _Tabs = New StringBuilder
End Sub

Private Sub AddTab(ByVal Text As String, ByVal ProfileNr As String)
    _Tabs.Append(class=""eviewButtonImage"")
End Sub

myCssFile.css
.eviewButtonImage{
   background-image:url('myImage.gif')
}

Is it anything wrong? please,i really need your help.