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Right, forgot to mention there is NPOI also, which we can use. But Epplus older ( previous than 5 )versions are free.

I think you can use EPPlus.Core version. For usual C# //provide file path FileInfo existingFile = new FileInfo(@"D:\sample_XLSX.xlsx"); //use EPPlus using (ExcelPackage package = new ExcelPackage(existingFile)) { //get the first...

You need to You need to Create Model First, create a new class in "Models" folder or somehwere in your project. name it as "FileDetails.cs" public class FileDetails{ public string Id {get;set;} public string URL {get;set;} } Something like this and save it in database using EF core...

If you want to upload file to google drive without asking user for credentials you need to use service account. https://qawithexperts.com/article/asp-net/upload-file-to-google-drive-using-service-account-in-c-mvc-w/241 Looks like you are not doing that. To make console app as Windows...