Hi,
You can do it in following steps.
1. take a excel sheet (formatted as you database table).
2. upload this excel file.
3. Read it by using SOME C# CODE and put data in a .net datatable or some other object.
4. open database connection and INSET THIS DATA TABLE data in data base.
You can take reference from .
https://www.google.co.in/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=c%23%20excel%20to%20datatable[
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