protected void Page_Load(object sender, EventArgs e)
    {
        FormsIdentity userId = (FormsIdentity)HttpContext.Current.User.Identity;
        userID = userId.Name;

     
            Player player = new Player();
            lbEditPlayers.DataSource = player.GetPlayerList(userID);
            lbEditPlayers.DataValueField = "User_ID";
            lbEditPlayers.DataTextField = "User_ID";
            lbEditPlayers.DataBind();
    }

 protected void SelectPlayer(object sender, ImageClickEventArgs e)
    {
        throw new Exception(lbEditPlayers.SelectedValue);
        if (lbEditPlayers.SelectedValue != String.Empty)
        {
            
            Session["playerID"] = lbEditPlayers.SelectedValue;
            showAthleticInfo(Session["playerID"].ToString());

            menu.Visible = false;
            modulePlayerManagement.Visible = true;
        }
    }

<h2>Edit Player</h2>
        <asp:ListBox id="lbEditPlayers" runat="server" />
        <asp:ImageButton SkinID="next" runat="server" style="display:block; margin:3px 0;" OnClick="SelectPlayer" />