Epplus 4.5.3.2 -

var worksheet = package.Workbook.Worksheets.Add("Sheet1");

using (var package = new ExcelPackage()) epplus 4.5.3.2

static void Main()

Install-Package EPPlus -Version 4.5.3.2 Or using .NET CLI: var worksheet = package

using (var package = new ExcelPackage(new FileInfo(@"C:\temp\sample.xlsx"))) var worksheet = package.Workbook.Worksheets.Add("Sheet1")