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Editorial Team
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Asked: 2026-05-20T03:28:59+00:00

I want to read already open excel file with C#. I am using this

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I want to read already open excel file with C#. I am using this method but it can’t read the excel file while the file is open in Microsoft excel. 

FileStream stream = File.Open("myfile.xlsx", FileMode.Open, FileAccess.Read);

It gives IOException: The process cannot access the file 'myfile.xlsx' because it is being used by another process.

I hope you understands what I mean. I want to keep excel file open and while file is open at Microsoft excel i want to read it from C#. I am using C# net framework 4.0

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1 Answer

  1. Editorial Team

    I think you can still copy the file while excel has it open, so you could make a copy of the file and then open that. Just make sure you clean up after yourself when you are done with the copy.

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