migrate data from excel sheet to sql server when excel sheet was approved

1) One way is , once the document is approved what you can read the excel file (using excel object model) and insert/update the values into sql server.

2) Second way, you can download the excel file into particular folder in the server, you can create a windows service which looks for the excel file read it and send the information into sql server.

3) Third way, I guess, you can SSIS packages from asp.net application. Once the document is approved, you call the ssis package to do the data transformation from excel to sql server.


HTH.