C #.net and data base

Question

Hello Everyone, I am creating a C# application  in which I want to import an excel file in C# ( in a data table ) perform some calculations , using loops and if/else conditions, and then export the results back to excel. Dont to know how to create a centralized datatable in C# which can be accessed by different forms at different instances. Looking for help and suggestions.

Thanks,
Gaurav