From: Torben Laursen on 23 Mar 2007 09:13 I often get a "Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE))" Error in Excel when I try to call my UDF in a save sheet. If I waite a few seconds the error goes away and everything works fine. The error comes from this line of code: App = (MSExcel.Application)Marshal.GetActiveObject("Excel.Application"); Where App is defined as private MSExcel.Application App; I read that I get a reference to Excel in the OnConnection function inside the Connect class. But how do I use that reference inside my UDF's? Torben
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