protected void rptAdminUser_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        var adminUserId = e.Item.FindControl("hfAdminUserId") as HiddenField;

        if (e.CommandName == "Edit")
        {
            Response.Redirect("Edit.aspx?id=" + adminUserId.Value);
        }
        if (e.CommandName == "Delete")
        {
            var adminUser = _adminUserBll.GetAdminUserById(Convert.ToInt32(adminUserId.Value));
            if (adminUser == null)
            {
                throw new ArgumentNullException("adminUser");
            }
            _adminUserBll.DeleteAdminUser(adminUser);
            LoadAllAdminUsers();
        }
    }