Check path if it is in virtual device or not, writable or not

Question

Hi everyone,
I'm currently making an application which encrypt file and users can decrypt the file anytime they want. After encrypting the file, I will delete the original file and when I decrypt, I will re-create the file to original position.
The question is : How can I check if the selected file or folder is in virtual device or removable devices such as CD-ROM ? Because we can not write file on them. 
And how to check if the path is writable or not :) .
Thank you :)

Answer 1

 >>How can I check if the selected file or folder is in virtual device or removable devices such as CD-ROM ?
Take a look at the PathIsNetworkPath Win32 function and the DriveType property of the System.IO.DriveInfo as described in the following thread:
http://stackoverflow.com/questions/2243569/check-if-path-is-on-network
>>And how to check if the path is writable or not :) .
You could try using the FileSystemSecurity class:
http://stackoverflow.com/questions/1281620/checking-for-directory-and-file-write-permissions-in-net.
But the easiest way is to try write to the file and then catch any exception that is being thrown if the write fails for some reason:
https://social.msdn.microsoft.com/Forums/en-US/f81bea37-26f5-44d8-bac4-bc534bbb03b4/c-how-to-check-file-folder-if-writable?forum=netfxbcl
There is however no boolean property of the FileInfo class called "IsWritable" or something if that is what you are looking for.
But please don't post any more questions that are not related to WPF in this forum. There is a C# forum for these type of questions:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=csharpgeneral
Please remember to close your threads by marking helpful posts as answer.