Access Control values from form to class.

I supposed that this is about an ASP.NET application, so if is so the solution is the next one:
In your Page_Init() event you have to init your drop down list like in the next example:

protected void Page_Init(object sender, EventArgs e)
        {
            if (CurrentUser.UserRole == UserRoles.Administrator)
                _editPopupControl.ShowCloseButton = true;
            //
            if (!Page.IsPostBack)
            {
                try
                {
                    //
                    // Init the center drop down list used as filter control
                    //
                    List<StoragePlan> itemsList = DataContext.StoragePlans.ToList<StoragePlan>();
                    Dictionary<string, int> dictionary = new Dictionary<string, int>();
                    foreach (StoragePlan storagePlan in itemsList)
                    {
                        if (!dictionary.ContainsValue(storagePlan.ID))
                            dictionary.Add(BaseListPage.GetEnumTextForValue(storagePlan.Type, typeof(StoragePlanTypes)), storagePlan.ID);
                    }
                    //
                    _storagePlanDropDownList.DataSource = dictionary;
                    _storagePlanDropDownList.DataValueField = "value";
                    _storagePlanDropDownList.DataTextField = "key";
                    _storagePlanDropDownList.DataBind();
                    //
                    _storagePlanDropDownList.Items.Insert(0, new ListItem(Resources.Resource.UserListPageNoStoragePlan, "-1"));
                    _storagePlanDropDownList.Items.Insert(0, new ListItem(Resources.Resource.UserListPageAllStoragePlan, "0"));
                    //
                    _storagePlanDropDownList.SelectedIndex = 0;
                }
                catch (Exception ex)
                {
                    BosEventLog.LogException(ex);
                    this.ErrorMessage = Resources.Resource.EntityLoadError;
                }
            }
        }

Then in could add a property in your class that return the selected value:

public int StoragePlanID
        {
            get
            {
                int entityID = 0;
                if(_storagePlanDropDownList.SelectedItem != null)
                    int.TryParse(_storagePlanDropDownList.SelectedItem.Value, out entityID);
                //
                return entityID;
            }
        }