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File Drag&Drop from Browser to Browser

My asp.net web application is some kind of "document managment system" saving files in the file system of the server.
The stored files are shown in an asp:ListView control and are downloadable as HTTP- Download. But I also want to drag&drop them into another browser window to upload the draged file to an cloud storeage like dropbox or google drive oslt.
I did some research and I didn't find any solution for this problem. I don't know if this is even possible. Maybe someone has an idea how this could be done?

I am pretty sure you can't have a web application doing that for you because it involves having your web language interacting with your computer, to move a local file to another window or tab in the browser.
It would be similar to have Javascript accessing your local files without the user "help". That is not allowed.
Rather than doing that, why not connect to Google Drive or Dropbox API and make the upload yourself?
In the piece of code where you trigger the download, you could also trigger an upload to the desired service.
Here are the API Documentation for the mentioned services:
https://www.dropbox.com/developers/documentation/http/documentation#file_requests-create
https://developers.google.com/drive/api/v3/manage-uploads

Select a file from user local machine in .Net MVC C# web application?

I have a .Net MVC C# web application. User needs to select files and uploads to server. For simplicity, let's assume just 1 file a time. Before upload the file, I want to check where the file comes from. In order to do that, I need to get the file's full path on local machine to validate the file. The path has all the information for the validation.
So, the question is: how we can have user select a file from local machine, and we can get its full path? Is it possible?
Or, this is impossible in web application and has to be done in desktop application?
Thanks

You can't for security reasons. It might have been possible on older browsers, but modern versions won't allow it.
In Chrome it won't even display the file path of a selected file in the control, instead showing C:\fakepath

Passing a stream from silverlight to browser

I have a silverlight application that retrieves a file from Amazon s3. At this point I am using a SaveFileDialog to save it to disk.
I am looking for a better way of saving the file.I have looked into and implemented Isolated storage but ultimately decided to not use it because of all the restrictions.
Also, silverlight restricts saving a file outside isolated storage without the save file dialog, so I cannot save a file and then pass the file path to the browser. so this is not possible
HtmlPage.Window.Navigate(urlToFile, "_blank");
What are the options I have left now to pass this stream to a browser?

There is a feature in silverlight 4 where you can run it out of the browser. In this mode you have elevated permissions. The one that would be of most interest to you is
File system access. Trusted applications can access System.IO types
and related types that are otherwise unavailable to Silverlight. These
APIs provide direct read and write access to files in user folders on
the local computer. For more information, see How to: Access the Local
File System in Trusted Applications.
Outside of this, there is no other way to save a file to the users desktop without using the SaveFileDialog

Use google doc API in asp.net C# web application

I am developing a web application in C#.net. I need to edit a file placed on the server in browser it self(Without downloading it on local machine) and when I save that file, the changes should be reflected in file. For this I want to use google API but I don't know how can I use this.
I want to do like below.
When I click on file name, it should open in browser.
When clicked on edit, it open in edit mode in browser using google doc.
When I save that file, the changes should be reflected in my file which is placed on company server.
How can I do all this thing with google doc API?

Install Google Drive on your server.
Edit the file in Google docs, let Google Drive sync it to the local hard drive.

It is not possible for HTTP protocol, because the basics system doesn;t support it. You can open the file but the file will be downloaded to your local machine in then it will open, you have to specify the MIME type in IIS.
You can use two ways to do a similar job done.
1 By Using FTP
2 Customized solution : Make a page put a text field and load the file (.cs) in it and with submit save it to the file back.

You can embed a google doc in Webpages. But the file would be accessed and saved on Google's servers and not your company server:
Wordpress allows you to do it. Potentially you can see if it possible to do it in a similar way:
http://en.support.wordpress.com/google-docs/
I am not sure if Google has an option of accessing docs from servers outside google's domain.

WebForm (INtranet) app - Prompt user the where to save file and use as default

I have a WebForm application that generates a Crystal Report and streams it to the browser as a PDF.
My users would like the app (well, the Browser I suppose!) to always prompt them where to save the file (a network path) and then store that path (probalby in the SQL table that stores their profile info) and always use that path as the default on subsequent attempts.
I am pretty sure I know how to force the browser (IE) to always prompt them where to save the PDF or open it, and I can name the file (attachment), but how can I automatically populate that dialog box that appears (when thy choose to save the file) with a path? Is there some other way I can accomplish this (use a different mime type or something?)?
I suppose instead of streaming the file back, I can just prompt them for where they want to save and (with elevated permissions on the App Pool Identity) save it out to that path from the server. Since this is an Intranet application, the App Pool does already have some elevated permissions, because it must check certain network paths to see if files exist (it is also a Change/Revision app for CAD Math Data files).
How would you handle it?

You absolutely can not force the web browser to choose any particular location by default to save files, without third-party plugins (most of which I hope would also similarly prevent this sort of thing, which could be used for Evil)
So, if the server has access over the Intranet, that's how you'll have to do it.