I tried to create a new excel workbook, but it’s doesn’t work. I use

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Asked: June 9, 20262026-06-09T15:05:03+00:00 2026-06-09T15:05:03+00:00

I tried to create a new excel workbook, but it’s doesn’t work. I use Visual Studio 2012 with .Net Freamework 4.5 and Microsoft Office 15.

I was looking at these articles:

If I try to create a new ApplicationClass("ApplicationClass xlsApp = new ApplicationClass();"), I get this error:

“Microsoft.Office.Interop.Excel.ApplicationClass’ cannot be embedded.
Use the applicable interface instead.”

I using Microsoft.Office.Interop.Excel.

Do you know the solution? Thank you in advance.

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Editorial Team · Answer 1 · 2026-06-09T15:05:04+00:00

Editorial Team

As the error clearly states,

Use the applicable interface instead.

Write new Application().
Even though Application is an interface, the compiler will convert this into the appropriate COM activation code.

The error is caused by Embedded PIAs; disabling that (in the reference properties) will also fix it.

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