Merge XLSX Files using C#. For more information, please follow link: https://kb.groupdocs.com/merger/net/merge-xlsx-files-using-csharp/

Merge XLSX Files using C#.cs

using GroupDocs.Merger;

namespace MergeXLSXFilesUsingCSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Set License to avoid the limitations of Merger library
            License lic = new License();
            lic.SetLicense(@"GroupDocs.Merger.lic");
            
            // Load the source XLSX file
            using (Merger merger = new Merger(@"sample1.xlsx"))
            {
                // Add another XLSX file to merge
                merger.Join(@"sample2.xlsx");
                // Merge XLSX files and save result
                merger.Save(@"merged.xlsx");
            }
        }
    }
}