Why Link Button control variable dosen't get any value?

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C#

ASP.NET

.NET

Hello I would be grateful if you could help me to solve the problem.

I created LinkButton that located inside of Repeater Control. CategoryID is a variable in LinkButton Control that have to get value after Repeater Control was bound to data. But CategoryID always get zero.

I have the following ASP and C# code:

<asp:Repeater ID="rpt1" runat="server" 
    OnItemDataBound="rpt1_ItemDataBound" 
    OnItemCommand="rpt1_ItemCommand">    

 <div><%# Eval("Name") %>-<%# Eval("CollectionType")%>
 <asp:LinkButton ID="LinkButton1" runat="server" Text="[edit item]"  PostBackUrl='AddItem.aspx?CategoryID=<%# Eval("CollectionID")%>' /> 

  </div>     
  </ItemTemplate> 
 </asp:Repeater>

Code behind:

public void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        List<GlassesCollection> gc = BL.GetDataBL.GetCollection();
        rpt1.DataSource = gc;
        rpt1.DataBind();
    }
}

Any idea why CategoryID variable dosen't get any value and how can i fix the problem?

Thank you in advance!