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Editorial Team
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Asked: 2026-05-30T16:53:51+00:00

I have a windows forms application that uses excel to generate some reports. Untill

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I have a windows forms application that uses excel to generate some reports.
Untill now it used 2003 but i’ve made an upgrade to use 2007. I have installed on my machine 2003, 2007 and 2010, and my app references Microsoft.office.core, v 12.0 and microsoft.office.interop.excel v 12.0.
But in my code, when i do :

using Excel = Microsoft.Office.Interop.Excel;
......
Excel.Application excelApp = new Excel.Application();
string v = excelApp.Version;

v will be 11.0 .
Also, the path references

C:\Windows\assembly\GAC_MSIL\Microsoft.Office.Interop.Excel\14.0.0.0__71e9bce111e9429c\Microsoft.Office.Interop.Excel.dll

How can this happen?
Any ideea how could i fix it ?

Thank you!

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1 Answer

  1. Editorial Team

    You shouldn’t keep both versions (at least on your dev machine).On your clients machine it shouldn’t be a problem . Normally in this situation your code should load the 2007 PIAs. I suggest that you should do a repair . Or do a complete fresh install of 2007.Or fiddle wth the registry and set the active version to 12 (which I don’t recommend)

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