Need An Application that works as windows Application as well as Sharepoint Application

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ASP.NET

SharePoint2010

Hi,

I have a peculiar requirement as below:

I'll have a document in the Sharepoint's Document Library or in my local machine.

Scenario 1: Sharepoint Application When I have the document in Sharepoint's Document Library.

step-1: An User Interface will open where I need to tell read data from Library's document as well as some primary data from database

Step-2: Through UI user will enter few more data. Collect those data and calculation will happen with already fetched primary data from Database and DocumentLibrary.

Step-3: Now Save data to database.


Scenario 2: Windows Application When I have the document in my local machine

step-1: The same User Interface should be loaded on page load and on_pageload read primary data from database.

Step-2: this is as same as the step-2 in the above Scenario.

Step-3: this will be saved as an .xml file in the local system.



Could you please let me know does this kind of application is achievable.If so, How ?

Thanks & Regards,
Mathi.