how to assign a password as system.security.secureString VB.NET 2.0

I want to open a file using a password with process start.  The password is "pass+word".  How can I convert the password to type system.security.secure string?

Dim sFile = "\\server\servdir\somefile.pdf"
Dim sUser As String = "user"
Dim sPass As String = "pass+word"
Dim SDomain As String = "XYZ"
 
'newPass = New System.Security.SecureString() ???????
 
Process.Start(sFile, sUser, newPass, SDomain)

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