How to read .cs file in C# ?

It's obscure your question.

Do you want open cSharpCode (.cs) from Excel VBA?

Or you want open csv files?

Any way you can do that with this sample: http://www.homeandlearn.org/open_a_text_file_in_vba.html

Hello Pankaj kumar,

you can visit below links,

Referenes:

https://www.c-sharpcorner.com/article/create-update-delete-and-reading-the-excel-file-in-c-sharp/
https://docs.microsoft.com/en-us/office/troubleshoot/office-developer/automate-excel-using-visual-c-fill-data
https://www.codeproject.com/Tips/696864/Working-with-Excel-Using-Csharp
https://bytescout.com/products/developer/spreadsheetsdk/read-write-excel.html

No I want to update value in .cs file through excel in c#

hi Pankaj,

If I understood your question correctly - you want to update some values in excel using C# ? AM I correct?