Modify excel cell

Question

Good morning, I would like to edit some cells from already existing excell file. I tried use EPPlus and normal OpenXml classes. However I failed. In both situation program w

Answer 1

I'm using ClosedXML where updating a cell value is a no-brainer:

var workbook = new XLWorkbook("HelloWorld.xlsx"); // load the existing excel file
var worksheet = workbook.Worksheets.Worksheet(1);
worksheet.Cell("A1").SetValue("Hello World!");
workbook.Save();

The NuGet package can be found here.