Try this
For main menu item
Menu1.Items[0].Enabled = Convert.ToBoolean(dt.Rows[0]["Status"]);
For child menu item
Menu1.Items[0].ChildItems[0].Enabled = Convert.ToBoolean(dt.Rows[0]["Status"]);
For sub child menu item
Menu1.Items[0].ChildItems[0].ChildItems[0].Enabled = Convert.ToBoolean(dt.Rows[0]["Status"]);
Here
dt
is your DataTable from Database
Set your indexes as per your requirements.