User Control not getting declarative property value

Question

I have a user control on a web form that is declared as follows:

<nnm:DeptDateFilter ID="deptDateFilter" runat="server" AllowAllDepartments="True" />

In the code-behind for this control, AllowAllDepartments is declared as follows:

internal bool AllowAllDepartments { get; set; }

Yet when I view the page, and set a breakpoint in the control's Page_Load event handler, my AllowAllDepartments property is always false. What are possible reasons for this?

BREAKING NEWS: Even setting the property programmatically has no effect on the property value when I hit my breakpoint in Page_Load of the control. Here is the Page_Load of the host page:

deptDateFilter.FilterChanged += deptDateFilter_FilterChanged;
if (!IsPostBack)
{
    deptDateFilter.AllowAllDepartments = true;
    PresentReport();
}

Answer 1

Try adding the property value to the ViewState:

protected bool AllowAllDepartments 
{
   get
   {
      if (ViewState["AllowAllDepartments"] != null)
         return bool.Parse(ViewState["AllowAllDepartments"]);
      else
         return false;
   }
   set
   {
      ViewState["AllowAllDepartments"] = value;
   }
}

EDIT Furthermore, you may want to handle the control's PreRender event, to see whether the the control's property has been correctly set there or not.