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A first chance exception of type 'System.Runtime.InteropServices.COMException'

Posted By:      Posted Date: September 29, 2010    Points: 0   Category :WPF

After calling a very simple WCF Service I bind the result an Observable Collection of Countries to WPF ComboBox, in second ComboBox of cities I displayed the filtered cities based on the selected country. It works fine the first time but when I select another country it takes lots of time to display, the Visual Studio 2010 output displays this like 50 times:

A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in mscorlib.dll

Intereting to point out that it only happens if I try to open the ComboBox and not if if navigate through code doing something like SelectedIndex=2 . It does not happen as well if instead of the ComboBox I use a ListBox or TreeView.

Some extra details.... the real exception detail is:

An event was unable to invoke any of the subscribers (Exception from HRESULT: 0x80040201)

Please help with this bug....

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