Compiler Error CS1617
Invalid option ‘option’ for /langversion. Use ‘/langversion:?’ to list supported values.
Invalid option ‘6’ for /langversion; must be ISO-1, ISO-2, 3, 4, 5 or Default
Right click on your project and select “Properties” from menu.
Select Build menu and, in the bottom, click on button “Advanced”.
In the next form you don’t have any voice for the field “Language Version”
AlphaVSS is a .NET class library providing a managed API for the Volume Shadow Copy Service also known as VSS
Error loading library AlphaVSS.x64.dll
if you have error loading the library probabilly you need to install on the machine the Visual C++ 2017 Redist package.
You can find it at this link
Control shadow copy
To control shadow copy, created using alphavss library, you have to open a command prompt whith administrative priviliges and type
to list your shadow copy you have to type :
vssadmin list shadows