Filestreams are a great way to store files in SQL Server. SQL Server makes this super easy by managing the storage of the physical files on the file system. But what if you want to get access to these files or if you want to know where they are stored. SQL Server wants you to access these files through a network share managed by SQL Server. They provide a function called PathName that you can call to get this path. You will call this function like you would call an extension method in .Net. In the example below, we will assume that the column InvoiceFile is a Filestream datatype. We call the PathName() function to get the share name to where the files are stored.
SELECT TOP 1 InvoiceFile.PathName() AS DirectoryOfFile FROM Invoice