Export datagridview added columns to excel +formatting

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I made a datagridview for a project of mine, which is displayed as in the picture below :

https://i.stack.imgur.com/JAjAs.png[^]

The columns on the left are generated from my database, while the ones on the right are added dynamically (they depend on a certain value).

Here is the code that I use to export it :

What I have tried:

The issue with it is that I don't get the dynamically added columns. The merging also doesn't work. Can anyone please help me? Thank you for your time !

Posted 22-Jun-23 21:41pm

LiterallyGutsFromBerserk

Updated 6-Jul-23 0:49am

v3

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Graeme_Grant · Answer 1 · 2023-06-23T00:13:00

Recommended method of doing work from C# was given here: Export datagridview to excel while keeping the formatting[^]:
1. Create a Macro recording of the actions that you wish to perform
2. View the VBA code generated for you
3. Use the VBA code to guide you for writing your C# code

If you follow these steps, and the original answer given, you will easily solve this question.