using System.Management.Automation;
using System.Management.Automation.Runspaces;

            Runspace runspace = RunspaceFactory.CreateRunspace();
            runspace.Open();
            Pipeline pipeline = runspace.CreatePipeline();
            pipeline.Commands.AddScript("powershell.exe -ExecutionPolicy Unrestricted -file D:\Files\Scripts\Script20180817.ps1 -FilePath " + file);
            pipeline.Invoke();
            runspace.Close();