I am having a problem using WinSCPnet.dll with PowerShell, in both ISE and VS2015.  
I am running Windows 10, PowerShell V5 (version 5 build 10586 revision 122)
I have the WinSCPnet.dll file in two places, the 
program files (x86) and in the script directory.
I am using classes within my PowerShell script, which is where WinSCP is not being recognized.
The references to WinSCP within the class fail.
    Unable to find type [WinSCP.Protocol]    
My script looks like this:
    $ScriptPath = $(Split-Path -Parent $MyInvocation.MyCommand.Definition) 
[Reflection.Assembly]::LoadFrom( $(Join-Path $ScriptPath "WinSCPnet.dll") ) | Out-Null
 
sessionOptions1 = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::ftp
    FtpMode = [WinSCP.FtpMode]::Active
}
 
Class Ftp
{
    Ftp()
    {
        sessionOptions2 = New-Object WinSCP.SessionOptions -Property @{
            Protocol = [WinSCP.Protocol]::Sftp
            FtpMode = [WinSCP.FtpMode]::Active
        }
    }
}
 * the references to 
[WinSCP.Protocol] and 
[WinSCP.FtpModel] within the 
class both underlined in RED.  (see attachment)
When I run the script within ISE, I get this:
    PS D:\> D:\testFTP.ps1
At D:\testFTP.ps1:14 char:29
+                 Protocol = [WinSCP.Protocol]::Sftp
+                             ~~~~~~~~~~~~~~~
Unable to find type [WinSCP.Protocol].
At D:\testFTP.ps1:15 char:28
+                 FtpMode = [WinSCP.FtpMode]::Active
+                            ~~~~~~~~~~~~~~
Unable to find type [WinSCP.FtpMode].
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : TypeNotFound
 
Within ISE I can "fix" this by typing the command within the script pane:
    add-type -Path 'C:\Program Files (x86)\WinSCP\WinSCPnet.dll'
 * to update the RED underlines I have to edit something within the code
Within VS2015 community edition, I am stuck.  
I can't get it to acknowledge WinSCP at all.
I checked my DLL's, and they are not blocked.  I registered the DLL and that didn't change anything.  I want to stress that WinSCP is working for me outside of a CLASS.  Within ISE, if I manually 
Add-Type to it, then WinSCP will work within a CLASS. This work around does not work with VS though. 
What can I do to fix this, and how can I get this PowerShell script to work within VS?