hi,

i have a problem and found not the solution.
In a usercontrol is a further usercontrol integrated.In the parent-usercontrol is a object.
When i access in the child-usercontrol of the object in the parent-usercontrol, i become a error-message.
Here is the code as example.

Listing.ascx.cs

public partial class Listing : System.Web.UI.UserControl
{
....
private ListingResult _listingResult;
public SearchResult searchResult { get { return _searchResult; } }
....
public Listing()
{
_searchResult = new SearchResult();
}
....

_searchResult = _searchResult.getSearchResultsFromQiuckSearch(Request["quickSearchString"]);
....
if (_searchResult != null)
{
//a control display on the website for me
Debugger.ausgabe += "Listing Zeile:79<br>searchResult.categorys.Count: " + searchResult.categorys.Count + "<br>";
//intergrate the child-control
_listingResult = (ListingResult)LoadControl("ListingResult.ascx");
plh_listingMainContent.Controls.Add(_listingResult);
}
....
//integrated the control display
this.lbl_1.Text = "<hr>anfang<hr>" + Debugger.ausgabe + "<hr>ende<hr>";
}

private ListingResult.ascx.cs

public partial class ListingResult : System.Web.UI.UserControl
{
private Listing _parent;
private SearchResult _searchResult;
...
public ListingResult ()
{
_parent = new Listing();
//to integrate the parent-usercontrol Listing
_parent = (Listing)this.Parent;
//my control display
Debugger.ausgabe += "ListingResult Konstrutor<br>Listing.searchResult.categorys.Count: " + _parent.searchResult.categorys.Count + "<br>";

}
}

I create the usercontrols in visual studio 10 on a local machine, to compile the code and copy the .ddl in the bin directory from umbraco on a webserver.
When i only activate the control-display (Debugger.ausgabe) in Listing, code to compile, is okay, copy to the webserver and refresh the website, i see the
display the category-list in searchResult have 5 entrys.

When i activate the control-display (Debugger.ausgabe) in Listing and in ListingResult, code to compile, is okay, copy to the webserver, i become a error
NullReferenceException: Object reference not set to an instance of an object.

I not understand, the object is in the parent-usercontrol exist.

Can you help me?

Sorry, my english is not the best, i hope the problem is understandable.

cu
harald