Unable to copy file to Machine on LAN using Share Path in Windows Forms Application

I want to create a folder and upload the doc to the server.

I put this code at app.config but it show error could not found a part of the path.

Or is there any other ways to upload doc to server?

<configuration>
       ....
     <appSettings>
       <add key="DocumentVault" value="\\10.100.100.10\C$\SomePath\SomeWhere\Else\"/> 
     </appSettings>
    ....
</configuration>