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Home/ Questions/Q 212969
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Editorial Team
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Editorial Team
Asked: May 11, 20262026-05-11T18:14:07+00:00 2026-05-11T18:14:07+00:00

I have to build a C# program that makes CSV files and puts long

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I have to build a C# program that makes CSV files and puts long numbers (as string in my program). The problem is, when I open this CSV file in Excel the numbers appear like this:

1234E+ or 1234560000000 (the end of the number is 0)

How I retain the formatting of the numbers? If I open the file as a text file, the numbers are formatted correctly.

Thanks in advance.

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  1. Editorial Team
    Editorial Team
    2026-05-11T18:14:08+00:00Added an answer on May 11, 2026 at 6:14 pm

    Format those long numbers as strings by putting a ‘ (apostrophe) in front or making a formula out of it: =”1234567890123″

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