C# How to read/update activex combobox from an Excel Macro-Enabled Workbook file (xlsm) -


i developing c# application opens, reads , updates excel macro-enabled workbook file (xlsm). able read , update cells not able read/update activex control, combobox.

using excel = microsoft.office.interop.excel;

using msform = microsoft.vbe.interop.forms;

i tried different recipes based on research (http://forums.asp.net/t/1244356.aspx/1/10) trying read selected item:

excel.shape ashape = xlworksheet.shapes.item(name);

object o = ashape.oleformat.object;

msform.combobox newbox = (msform.combobox)(((excel.oleobject)o).object);

or alternatively

excel.oleobject cb1 = (excel.oleobject)xlworksheet.oleobjects(name);

msform.combobox combo1 = (msform.combobox)cb1.object;

but when try run code following error:

system.invalidcastexception : unable cast com object of type 'system.__comobject' interface type 'microsoft.vbe.interop.forms.combobox'. operation failed because queryinterface call on com component interface iid '{8bd21d33-ec42-11ce-9e0d-00aa006002f3}' failed due following error: interface not registered (exception hresult: 0x80040155).

here details of environment:

  • windows 7 64bit
  • ms visual studio 2008 professional edition
  • .net 3.5 sp1
  • microsoft excel 14.0.6129.5000 (32-bit)

as project references, added .net components:

path: c:\program files (x86)\microsoft visual studio 9.0\visual studio tools office\pia\office12\microsoft.office.interop.excel.dll

runtime version: v1.1.4322

version: 12.0.0.0

path: c:\program files (x86)\microsoft visual studio 9.0\visual studio tools office\pia\office11\microsoft.vbe.interop.forms.dll

runtime version: v1.1.4322

version: 11.0.0.0

any ideas on reason? if know how change selected item combobox please share :)

thank you!


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