Combine Multiple Excel Files into One using C#

CombineExcelFiles.cs

// Open the first excel file.
Workbook SourceBook1 = new Workbook("Excel A.xlsx");

// Open the second excel file.
Workbook SourceBook2 = new Workbook("Excel B.xlsx");

// Open the third excel file.
Workbook SourceBook3 = new Workbook("Excel C.xlsx");

// Copy worksheets of second Excel file to the first workbook.
SourceBook1.Combine(SourceBook2);

// Copy worksheets of third Excel file to the first workbook.
SourceBook1.Combine(SourceBook3);

// Save the updated first excel file as a new file.
SourceBook1.Save("CombinedFile.xlsx");