/// <summary>
 /// Fill the category to the dropdown for adding the items to particular category
 /// </summary>
 protected void Page_Load(object sender, EventArgs e)
 {
     if (Session["admin_id"] == null)
     {
         Response.Redirect("default.aspx");
     }
     if (!IsPostBack)
     {
         st = "select category_id,category_name from tbl_category where is_active = 1";
         db.fill_drop_with_id(st, ddl_category);
         fill_data();
     }
 }