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DropDownList en masterpage

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hola a todos...

me pueden ayudar estoy creando una aplicacion.. donde en la master tendo un ddl que me carga los datos en page_load.. y en el DDMarcas_SelectedIndexChanged... y quiero que al seleccionar un item del ddl no se pierda el valor al hacer postback... tengo esto pero no me funciona...

protected void Page_Load(object sender, EventArgs e)
    {
       
        ScriptManager scripManager = ScriptManager.GetCurrent(this.Page);
        if (!IsPostBack)
        {
                   marcas();
           
        }
        else
        {
            if (Session["ddlselectionvalue"] != null)
            {

              DDMarcas.SelectedValue = Session["ddlselectionvalue"].ToString();
             

            }
        }
             
    }

protected void DDMarcas_SelectedIndexChanged(object sender, EventArgs e)
    {
        Session["slectedValue"] = DDMarcas.SelectedValue;
          Response.Redirect("Catalogo.aspx?val12=" + DDMarcas.SelectedItem, true);
       
    }


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