Is there any way to show user popup to give the name to create folder
And with that if he does not want to create folder then he should be shown the list of folders to which he want to save the file
As I mentioned by commenting that Functionality like
SaveFileDialog is only possible in Windows Forms application, you cannot do this in asp.net
The alternatives in asp.net are difficult however as an alternate there is a third party editor available on the web called CKEditor 3.x Developer's Guide.
You can use File Browser (Uploader) for the purpose you want to achieve.