Master page Page_Load event call only one time

yes i have add that too..but its alwys false....
actully me write code on desing page. like

<div class="menus">

<ul>
<%
ApplicationLogic objBAL = new ApplicationLogic();

if (!this.IsPostBack)
{
DataTable dt = objBAL.GetDataForReports("SELECT * FROM DashBoardMenus Where ParentMenuId=0 and isdeleted=0 ORDER BY OrderID");
DataTable dt1;
int TableId = 0;
for (int i = 0; i < dt.Rows.Count; i++)
{
dt1 = objBAL.GetDataForReports("SELECT * FROM DashBoardMenus Where ParentMenuId=" + dt.Rows[i]["MenuID"].ToString() + " and isdeleted=0 ORDER BY OrderID");
Response.Write("<li class='with-submenu'>");
Response.Write("<div class='label'> " + dt.Rows[i]["MenuName"].ToString() + " </div>");
for (int j = 0; j < dt1.Rows.Count; j++)
{
if (Global.IsSuperUser == false)
{
TableId = Convert.ToInt32(dt1.Rows[j]["TableId"].ToString());
if (objBAL.CheckModuleRight(DBOperation.View, CommonInfo.CurrentUserID, TableId))
Response.Write("<ul><li>" + dt1.Rows[j]["MenuName"] + "</li></ul>");
}
else
{
TableId = Convert.ToInt32(dt1.Rows[j]["TableId"].ToString());
Response.Write("<ul><li>" + dt1.Rows[j]["MenuName"] + "</li></ul>");
}
}
Response.Write("</li>");
}
}
%>
</ul>

</div>