// ////////////////////////////////////////////////////////////////////////
        // INITIAL EVENTS
        //
        protected void Page_Load(object sender, EventArgs e)
        {
            // Register client scripts
            this.RegisterClientScripts();

            if (!IsPostBack)
            {
                // Security check
                if (!(Convert.ToBoolean(Session["sgLFS_RESOURCES_MATERIALS_ADD"])))
                {
                    Response.Redirect("./../../error_page.aspx?error=" + "You are not authorized to view this page. Contact your system administrator.");
                }

                // Validate query string
                if ((string)Request.QueryString["source_page"] == null)
                {
                    Response.Redirect("./../../error_page.aspx?error=" + "Invalid query string in materials_add_request.aspx");
                }

                // Tag Page
                hdfCompanyId.Value = Convert.ToInt32(Session["companyID"]).ToString();

                // If coming from
                // ... employee_navigator.aspx
                if (Request.QueryString["source_page"] == "lm")
                {
                    // ... Initialize tables
                    materialsAddTDS = new MaterialsAddTDS();

                    MaterialsAddGateway materialsAddGateway = new MaterialsAddGateway(materialsAddTDS);
                    materialsAddGateway.LoadAll(Int32.Parse(hdfCompanyId.Value));

                    // ... Store tables
                    Session["materialsAddTDS"] = materialsAddTDS;
                }

                // StepSection1In
                wzMaterials.ActiveStepIndex = 0;
                StepBeginIn();
            }
            else
            {
                // Restore tables
                materialsAddTDS = (MaterialsAddTDS)Session["materialsAddTDS"];
            }
        }
 /// <summary>
 /// InitData
 /// </summary>
 protected override void InitData()
 {
     _data = new MaterialsAddTDS();
 }