How to pass 2 values with a Button in a ListView

 Hi
I have a Button in a ListView, when I click the Button I need to pass 2 values I have readily available in the ListView and do something with them in the Button click event.
I have tried myself with a querystring, my Button looks like this:
<asp:Button ID="removeNoteButton" runat="server" Text="Remove Note" PostBackUrl='<%# String.Format("Member.aspx?NoteID={0}&ShowUserID={1}", Eval("NoteID"), Eval("FromUserID")) %>' OnClick="removeNoteButton_Click"/><br />
But I think there is something wrong with the way I write the querystring, can you help me get it work. I am also open to other means of transfering the information to the Button click event.
...