Apr 23, 2018 07:29 AM|Yohann Lu|LINK
I want to create a c# program that would process and map two excel file together.
What's the type of your C# program, Asp.net or Desktop App? If your app is a desktop application, you can go to the
Visual C# Forum
for getting suitable help.
Usually, we can process excel and merge related data in ASP.NET program.
You can refer the following samples.
1: Read and Import Excel File into DataSet or DataTable using C# and VB.Net in ASP.Net:
2: Merging data through DataSet
3: Create a create Excel file using OpenXML
For more detailed, please see : How to Create Excel file in ASP.NET C#